WiFi connection drops, have to reboot - Virgin hotspot - Nexus 7 Q&A, Help & Troubleshooting

My Nexus 7 had no problem with wifi connections since I bought in right after they were first released. Last week, I bought a Virgin Broadband Mobile Hotspot to use while doing some traveling. (In some areas, it works a lot better than I expected.) The problem is that fairly frequently, the connection drops and I can't reconnect. When reselecting the device (or any other network) in the list of available wifi networks, I get an error message that reads "failed to connect to network." My only recourse is to reboot. A fast reboot is good enough, but I've done plenty of those and complete reboots.
Then, I can reconnect. That new connection may last ten minutes or many hours. But at some point, the connection will drop and I'll have to reboot to get another one.
I figured this must be related to the Virgin hardware, but when I got home yesterday, I discovered that this happened again with my router. In the 5 months I've had the Nexus 7, I've never had a problem connecting to my home router. So I "forgot" my remembered wifi networks and reestablished them. There are only two, my home router and the Virgin device. Didn't help. Right now, I don't have the Virgin device turned on, so maybe this will temporarily solve the problem. I'm not sure, yet.
One thing that seemed to help was that when driving and using the Google Navigation app, this seemed to be less of an issue. It's even possible that we never dropped a connection while navigation was active. When nav is active, the device doesn't sleep. So there may be some relation there. But plenty of connections were dropped while nav was off and the device was awake. In fact, most drops occur when I'm stationary, i.e., not in a moving car or walking around.
Another piece of info — our other Nexus 7, which also came along on the trip, doesn't seem to have this problem, but it didn't get used that much, so it may be that it would be there, we just didn't have the opportunity to see it happen.
Anyone seen anything like this and/or have any ideas about what to do about it? Why would I need to reboot to renew a connection?

I had a similar issue,it would see connections not connect automaticly and when trying to manually connect it would disappear.I shut off the autoscan for networks off and it works much better.
Hope this helps
Sent from my SGH-I927 using xda app-developers app

Thanks. I'll play with that and see what happens.

The nexus 7 that I purchased for my wife last week is experiencing the similar issue. I can see many network in range but any connect I try to connect will return a message "failed to connect to network".
I found some submitted issues on the Android project thread, but none of them offered any solution.
http://code.google.com/p/android/is...c=ID Type Status Owner Summary Stars&id=40437
http://code.google.com/p/android/issues/detail?id=40065
I'll try this at some other places to make sure the problem persists and will probably return it.

Related

Wi-fi not working

After connecting to 3 different wireless connections and none of then working, I'm concluded that my wifi isn't working.
I go to settings and check wifi on, it finds the network, connects, but I lose my entire data connection for the duration wifi is turned on!
Is anyone else having this problem?
Sent from my Samsung Vibrant
I'm having the same issues with the wifi. I downloaded wifi analyzer to make sure I was on a good channel. Set it to the best channel and my signal strength is 100%. I will be able to connect for a little bit but for some reason it goes in and out, connection unsuccessful, yada yada yada. I messed with all the troubleshooting solutions for my router (dgl-4300) but nothing works. If anyone can reply with a fix or point me in the right direction, that would be greatly appreciated.
Same Issues
Any help is greatly appreciated. Data working fine when on 3G but Wifi = no data. Connection is fine, IP is fine.
UPDATE: It's working again on my home WIFI. Will have to see if it's just an "at work" issue. Hopefully IT can assist.
Same problem with Verizon MiFi
I have had ZERO problems connecting to the Linksys access points we have setup at my home and my office, but recently my work provided me with a Verizon MiFi (as well as an iPad - don't hate ) and I've had MANY issues trying to get my Vibrant to consistently connect to the MiFi.
My iPad, Motorola Droid, and Laptop have no issues connecting to the MiFi.
On my Vibrant I'm running the 2.1 stock ROM with root & the latest ClockWork recovery.
It will "connect" to the MiFi (I use quotes because I can't really tell - it AT LEAST receives an IP). But I'm unable to send and receive data. I can't even browse to the MiFi's internal configuration page .
To FINALLY get it to connect consistently I have to do some kind of random combo toggling the wifi off and back on and then turning the MiFi off and back on and it will EVENTUALLY connect and stay connected with data flowing freely.
I've customized my configuration a little bit on the MiFi so I'm going to reset it back to factory and not change the config to see if it makes a difference - because at lunch I was able to connect to my boss' MiFi with no problem. I'm thinking it may either be the phone or the mifi...
I've connected to about 10 different wireless networks with NO issues, at all. The connectivity is actually much better than my G1/Nexus.
HOWEVER, last night at a bar I was connected to their wifi, strong signal, but I was not able to use Data. I was in a very poor reception area for T-Mobile... don't think that could be an issue, bit the other places I use wi-fi that is not the case.
I just chalked it up as a fluke and moved on. Not sure what was wrong.
I had this happen to me today. I just rebooted and it went away. Toggling wifi didn't help, but I only tried it once. The phone reboots so quick I figured I'd give it a try.
I have set the phone up manually with static ip. Seems like its a problem with the dhcp.
robnil said:
I have set the phone up manually with static ip. Seems like its a problem with the dhcp.
Click to expand...
Click to collapse
I'm gonna try this.
Sent from my SGH-T959 using XDA App

Wi-Fi auto connect issues

I am having problems with my Nexus 4 not automatically connecting to Wi-Fi. This is particularly annoying as I only live a few minutes from Uni so I spend the day cycling between my home network, uni network and 3G and set tasker to do things based on where I am. However, I look at my phone it tells me I have plenty of wifi signal yet it hasn't connected. This means I either have to switch the wi-fi off and on (which seems to take longer than it should to switch back on) or reboot the phone. After this it will connect fine. Is this a software issue? Or something that is just wrong with my phone?
Cheers
I too have wifi connection problems with my Nexus 4. I can get it to connect, but it won't reconnect. Not only does it not reconnect, it doesn't even detect that the network it was just configured to connect to is sitting right in front of it.
I've tried using Wifi Analyser, and it will show all the wifi signals in my area including those of my neighbours across the street, but it simply doesn't even show my wifi signal. Oddly in Settings, sometimes my wifi signal is not listed at all (reflecting Wifi Analyser's view), and sometimes it is listed but shown as 'Not in range'. It is very frustrating, and the only reason I have not yet RMA back to Google is I have a slight hope that the next update (4.2.2) will fix it.
Needless to say, I have a number of other devices at home (Lenovo and HP laptops, iOS tablets and phone, Windows RT tablet, Windows Phone, and Nexus 7) all of which connect to my home network OK. It is clearly a bug in the Nexus 4.
I had the same problem as you guys, i flashed Franco Kernal and it works a treat now.
Not forgetting the extra battery life the kernel provides.
I suggest trying it out.

G2 Verizon - Wifi Won't Connect

Has anyone had any issues connecting to Wifi networks on their G2s? I got the verizon version on Saturday and haven't been able to get the phone working on 2 different wifi networks. I can connect to the wifi network just fine, but I can't access the internet at all. I can confirm that other devices are able to connect no problem.
Curious if anyone has some thoughts on how to potentially fix this. If not, will be heading back to Verizon to get a new one. Thanks in advance for the help.
Re:No wifi Connect
au6768 said:
Has anyone had any issues connecting to Wifi networks on their G2s? I got the verizon version on Saturday and haven't been able to get the phone working on 2 different wifi networks. I can connect to the wifi network just fine, but I can't access the internet at all. I can confirm that other devices are able to connect no problem.
Curious if anyone has some thoughts on how to potentially fix this. If not, will be heading back to Verizon to get a new one. Thanks in advance for the help.
Click to expand...
Click to collapse
I have the AT&T G2 version , it will connect to any wireless router but the connection will last 5 seconds then no internet, this is totally unacceptable I upgraded from the G-Pro and may go back as that never had this issue, I did read LG had a similar problem with the Nexus 4 and Optimus G
Mine works fine. I have a VZW G2 and an ATT G2 connected on the same router. It connects to both G and N networks.
No issues with my Verizon G2.
au6768 said:
Has anyone had any issues connecting to Wifi networks on their G2s? I got the verizon version on Saturday and haven't been able to get the phone working on 2 different wifi networks. I can connect to the wifi network just fine, but I can't access the internet at all. I can confirm that other devices are able to connect no problem.
Curious if anyone has some thoughts on how to potentially fix this. If not, will be heading back to Verizon to get a new one. Thanks in advance for the help.
Click to expand...
Click to collapse
Did you try rebooting your router? I see this at home with the families iOS devices a lot, especially after heavy data traffic. I'll turn off the router for a couple hours or overnight and the next day all is well. Router is open, no encryption.
au6768 said:
Has anyone had any issues connecting to Wifi networks on their G2s? I got the verizon version on Saturday and haven't been able to get the phone working on 2 different wifi networks. I can connect to the wifi network just fine, but I can't access the internet at all. I can confirm that other devices are able to connect no problem.
Curious if anyone has some thoughts on how to potentially fix this. If not, will be heading back to Verizon to get a new one. Thanks in advance for the help.
Click to expand...
Click to collapse
I have the exact same problem. It will sometimes transfer some data using browsers, but nothing on facebook, pandora, or the play store it will say connection lost or not data connection.
My wife has the same phone and it works no problem and also the laptop. Must be a dud wifi radio or something like that. Mine is going back to the store tomorrow.
au6768 said:
Has anyone had any issues connecting to Wifi networks on their G2s? I got the verizon version on Saturday and haven't been able to get the phone working on 2 different wifi networks. I can connect to the wifi network just fine, but I can't access the internet at all. I can confirm that other devices are able to connect no problem.
Curious if anyone has some thoughts on how to potentially fix this. If not, will be heading back to Verizon to get a new one. Thanks in advance for the help.
Click to expand...
Click to collapse
Are you trying to use adblock by any chance? I was and it was causing the same issue you have. I uninstalled it and changed my proxy settings back to none and wifi is working great now.
Just received my LG G2 White brand new from T-Mobile about 2 hours ago. After many attempts to troubleshoot the issue it all failed. The problem is Wifi will connect to router and even work but after 30 seconds the connection goes down. The actual Wifi signal shows connected but no internet it gets stock. We tried resetting the phone and toggling with different features but still it did the same thing. T-Mobile is the worst they were trying to have me ship the phone back and leave me phone less for days. I complained and they are sending another one overnight but have charged me for the phone on my account. Mind you I've had months of bad service, after all I think I got a defective phone. I've read some other people having the same issue with other carriers. If I get another one with the same issue I'm jumping boat. If anyone knows of a work around let me know. I tried 2 different routers same issues connects then it randomly disconnects and stops downloading or transferring data.
Reset Phone - didn't work
Turned off mobile data - didn't work
Turned off wifi sleep - didn't work
I'm on Verizon. I have trouble with initial connection to wi-fi. It says obtaining IP address for a very long time. Even if I have a very strong signal. It takes about five minutes. It eventually connects and works fine. Then next time I try to connect to that router it works fine. It's only the first time I try to connect to a new router.
I just got this phone over the weekend and I was also having trouble connecting to my home wifi.
It would stay connected for 30 seconds or a couple of minutes then disconnect however the entire time the status under the Wi-Fi settings page says Connected even though I couldn't access the internet or the admin page of the router. Frustrating. If I turned off the mobile data, the wifi, the phone, the router, or some other unknown combination of events it would then reconnect again for another 30 seconds to a couple of minutes.
I called Verizon, they told me to take the phone back since I was within my 14 days. I did this and was optimistic. Then the new phone immediately experienced the same issue.
I did some more research, changed my router from 20 mhz channel width to auto 20/40 mhz. Not sure why it was set to just 20. I thought that would fix it. Nope.
I tried to set my phone to use a static IP, that didn't work either.
Then last night I tried the WPS Push Button option instead of using a password. This method worked and my phone stayed connected. I haven't had a chance to repeat my steps to verify it works again but wondering how other people are connecting, password, wps push button, wps pin? WPS is not my preferred option due to the security risks but just trying to track down what works and what doesn't.
I am able to connect at work just fine using a password.
I'm having a similar problem - my work network has no problem connecting while my home network almost never works with this phone (~25% of the time, other devices have no problem). Occasionally, resetting the phone or just turning on-and-off WiFi fixes the problem, but more often I just give up and use 4G. Anyway, if anyone finds a solution, please post! This is such a standard feature that should really work out of the box.
In case it helps, my home network uses "WPA/WPA2 PSK" security and my work connects to "802.1x EAP" security - also I'm not adverse to changing the security options if it fixes the problem.
Thanks! Nick
After reading more on this, I've decided this issue is router related not phone related.
I discovered my router reached end of life in April of this year is no longer receiving firmware updates. Newer versions of my router have received multiple updates since then.
I will be buying a new router. I report back on if it works.
I really don't think it is "router related" as all my other devices work as expected with my router. A new router may fix the problem, but I'm pretty sure the phone's WiFi is buggy and not the router..
Sent from my VS980 4G using XDA Premium 4 mobile app
In my situation it really appears to be how my router is handling the connection when I connect with a password since I can connect with limited security.
Does your router have a firmware update available for it? If so, have you applied it?
Received my new to me router yesterday with updated firmware as of 10/7/13.
My phone was connected for a few hours last night and I have not had any problems today. I'll report back if I start experiencing any issues but getting rid of my old, end of life router and replacing it with a newer router worked for me.
I did not buy a brand new router either. I went with a cradlepoint mbr95 which has been on the market for awhile and has already had a few firmware updates.
Check you wireless security settings
Had a similar issue to this and it seemingly was resolved when I moved the wireless router security over from WPA/WPA2 personal to WPA2 personal only. The phone found the WAP and connected right away. I tried to reproduce the behavior but alas I have not been able to do so. Perhaps this will help others.
hi guys
i found the problem
it happens just when you disable auto update in "settings>general>about phone>update center>software update>check automatically"

WiFi not connecting

As the title says, when I leave the house and come back it doesn't automatically connect to WiFi, anyone else have this problem?
I've changed the 2.4 and 5ghz to manual with no joy, its back to auto now.
Any other ideas?
Same problem here... :/ Using a Nexus 6p as well, when I get home it never connects, need to turn wifi off, and then back on to be able to connect...
No problem here with my work and home WiFi, both 2.4Ghz and 5Ghz.
I had that problem and fixed it by changing channels and going down from 40mhz to 20mhz. Not sure which made the difference but my 6p connects right away now whilst before I had to toggle the WiFi.
Sent from my Nexus 6P using Tapatalk
here is the video of my problem
https://www.youtube.com/watch?v=TjznyoEnip0
I also have an issue connecting my Nexus 6P to my corporate Wifi network - I am seeking the specific details, but all I know so far is that it's a CISCO Access Point. The Nexus 6 had no problems at all. A colleague did briefly get his 6P connected, but then it appeared to break (he's not sure, but suspects it was after the November security update). It continually tried to connect and then eventually says Authentication problem (despite trying all sensible options for Forgetting, rebooting, changing password, confirming it still works for Nexus 6 w/ new password etc etc)
I am seeing this same issue with all of the 5GHz networks i use. It connects just fine but i need to choose it in the pulldown settings...does not automatically connect anymore.
This is something that started happening out of nowhere. it was fine after the latest update at the beginning of november but now has this issue.
Maybe reflash the system and clear the cache may do the trick but need to try.
Wondering why this is not an issue being spoken about more here. I'm sure its more widespread than it would seem here...
This is happening to my Nexus 6p too. when the phone switches to data network it doesnt connect back to wifi, i have to manually toggle the wifi on phone to connect to my wifi.
I have tried this at my friends home too and it doesnt look like an issue with the router, my nexus 6 connects compeletly fine without any issues.
Also I have noticed wifi disconnect when the screen is closed intermittently?
Is this an hardware issue?
Here is another person having the same problems. I changed my phone but I'm having the same issue on the new phone. It doesn't matter which location my phone is. It happens on every location.
nmstoker said:
I also have an issue connecting my Nexus 6P to my corporate Wifi network - I am seeking the specific details, but all I know so far is that it's a CISCO Access Point. The Nexus 6 had no problems at all. A colleague did briefly get his 6P connected, but then it appeared to break (he's not sure, but suspects it was after the November security update). It continually tried to connect and then eventually says Authentication problem (despite trying all sensible options for Forgetting, rebooting, changing password, confirming it still works for Nexus 6 w/ new password etc etc)
Click to expand...
Click to collapse
Had the same thing. Connected just fine until something suddenly changed and it wasn't working anymore. It worked on other access points of the same WLAN as well as my home WLAN. Yesterday I changed the DNS Hostname of my Nexus (because "android-[insert random number here]" makes no sense) and suddenly it works again. Could be a coincidence though...
I've seen this issue on 5ghz networks on an HTC one m7, a Samsung galaxy s6 , this device and my Samsung Galaxy tab 4. It would seem to me it's an android issue.
Count me as another one with the automatic connectivity not working. Running stock 6.0.1 on Nexus 6P

Intermittent Wifi Disconnect - Logs included

My Nexus 6P has the bootloader unlocked but is running completely stock, un-rooted, vanilla android (MDB08M). Project Fi is my carrier. When I am at home and on *most* wireless networks, I see no issue. While I am at work, my wifi constantly disconnects and reconnects. I will pick up my phone, and it will either A) not have wifi (though I have previously been connected) and quickly reconnects or B) Will have wifi, but after some amount of use, will disconnect from wifi, then reconnect a few seconds later.
I've tried all the simple items:
Making sure "Keep wifi on during sleep" or whatever the setting is is turned on
Turn off optimization on Google Connectivity Services
Forget network and reconnect
etc...
I turned on verbose wifi logs and was able to catch a logcat of when the issue occured. The disconnect occured at almost exactly 9:29:00, as I saw my wifi go out and then almost immediately after the clock tick 9:29.
I can't find anything in particular that stands out as the cause or leads to a solution.
I assume it is some misunderstanding between my job's wireless network and my phone. My previous phone (Nexus 4) had none of these issues. I am unclear on whether this is a Marshmallow issue, Project Fi issue, or what software might be causing it. Since it only happens on this certain network, I am making the assumption it is most likely software and not a faulty wireless chip. I have no control over the wireless configuration of the network, so anything on that end is a non-starter.
Any help or direction on where to look next is greatly appreciated!
Dropbox link to txt logs: https://www.dropbox.com/s/co95ov2u5kps23s/wifi_log_092855.txt?dl=0
I have exactly the same issue. It seems to happen mostly at work - my phone is locked laying on my desk for some time, and when I pick it up and unlock it, there is no WiFi connection but it reconnects after few seconds. It happens randomly as sometimes WiFi connection is there after unlock. It also happend at my home wifi network, though it's more rare at home.
I have two friends at work having Nexus 6P and they don't have this issue, so it looks like something wrong with my unit. I have 'Keep wifi on during sleep' turned on. Any ideas?
manalesar said:
I have exactly the same issue. It seems to happen mostly at work - my phone is locked laying on my desk for some time, and when I pick it up and unlock it, there is no WiFi connection but it reconnects after few seconds. It happens randomly as sometimes WiFi connection is there after unlock. It also happend at my home wifi network, though it's more rare at home.
I have two friends at work having Nexus 6P and they don't have this issue, so it looks like something wrong with my unit. I have 'Keep wifi on during sleep' turned on. Any ideas?
Click to expand...
Click to collapse
I haven't made much headway but I have filed an Android bug here: https://code.google.com/p/android/issues/detail?id=196035
It has the attention of the networking devs. Any further evidence (bug report!) you can provide there would be extremely helpful.
manalesar said:
I have exactly the same issue. It seems to happen mostly at work - my phone is locked laying on my desk for some time, and when I pick it up and unlock it, there is no WiFi connection but it reconnects after few seconds. It happens randomly as sometimes WiFi connection is there after unlock. It also happend at my home wifi network, though it's more rare at home.
I have two friends at work having Nexus 6P and they don't have this issue, so it looks like something wrong with my unit. I have 'Keep wifi on during sleep' turned on. Any ideas?
Click to expand...
Click to collapse
I'm seeing this same issue as well, I submitted logs to the bug report opened by cpswaim, but I wonder if this is a different issue and I should have opened a new bug.
]grimm[ said:
I'm seeing this same issue as well, I submitted logs to the bug report opened by cpswaim, but I wonder if this is a different issue and I should have opened a new bug.
Click to expand...
Click to collapse
If those are your bug reports, the error in the reports:
FAILURE: LOST_PROVISIONING, NeighborEvent{elapsedMs=94908702, 192.168.1.1, [(null)], RTM_NEWNEIGH, NUD_FAILED}
is the same error I'm getting. My phone disconnects while the screen is off, I've just also caught it disconnecting with the screen on too, so I'm under the impression our situations are related, if not the same.
Thank you for the bug reports!
cpswaim said:
If those are your bug reports, the error in the reports:
FAILURE: LOST_PROVISIONING, NeighborEvent{elapsedMs=94908702, 192.168.1.1, [(null)], RTM_NEWNEIGH, NUD_FAILED}
is the same error I'm getting. My phone disconnects while the screen is off, I've just also caught it disconnecting with the screen on too, so I'm under the impression our situations are related, if not the same.
Thank you for the bug reports!
Click to expand...
Click to collapse
Not getting this error in my reports, but experiencing the same issue on stock 6.0.1 rooted. Can't find any solution.
qtpa2tnh said:
Not getting this error in my reports, but experiencing the same issue on stock 6.0.1 rooted. Can't find any solution.
Click to expand...
Click to collapse
I wasn't getting that error either, one of the Google engineers on cpswaim's bug asked me to open a new bug report instead and I did so here: https://code.google.com/p/android/issues/detail?id=197272
]grimm[ said:
I wasn't getting that error either, one of the Google engineers on cpswaim's bug asked me to open a new bug report instead and I did so here: https://code.google.com/p/android/issues/detail?id=197272
Click to expand...
Click to collapse
Thanks for the link!
Since Greenify's Aggressive Doze feature is what caused my status bar clock to freeze last time I had an issue, I disabled Greenify but my wifi issue persists (although not as severe). I got a logcat and saved it right after the wifi dropped and reconnected, anybody with some knowledge who can see what's going on in there?
Edit: The general consensus online is that this is a Marshmallow issue. I don't have unlimited data so at home on wifi, this is a killer.
So I reflashed my stock boot image (6.0.1_r3 MMB29M), flashed FED Patcher, flashed the latest systemless root (2.64), and deleted the legacy directory Chainfire had made for old root apps that hardcoded to su (I deleted /su/xbin_bind) to get Android Pay working again...
My wifi issues have disappeared. I've seen a lot of reports saying the issue mysteriously resolved itself, but could it have been anything I just did?
Edit: Wifi is still randomly shutting off while the screen is off, but will even sometimes turn back on. The intermittent connection dropping is gone though.
This has been a constant issue for me starting with the Developer Previews on my Nexus 5 and has now moved onto my Nexus 6P.
i'm getting sick and tired of these little issues. google needs to fix this **** asap. such bull**** to have to deal with this crap
I had this issue on my home network with my Samsung devices. My tablets and TV would always drop off. My router was a cheap Asus model and was showing its age. I bought the brand new Asus router
"Asus - Extreme Wireless-AC2400 Dual-Band Gigabit Router - Black
Model:*RT-AC87R/U"
And I have not had a single drop since. Even on marshmallow. Now I know this isn't a cheap or reasonable fix but it seems maybe older hardware is to blame. YMMV
Gizmoe said:
I had this issue on my home network with my Samsung devices. My tablets and TV would always drop off. My router was a cheap Asus model and was showing its age. I bought the brand new Asus router
"Asus - Extreme Wireless-AC2400 Dual-Band Gigabit Router - Black
Model:*RT-AC87R/U"
And I have not had a single drop since. Even on marshmallow. Now I know this isn't a cheap or reasonable fix but it seems maybe older hardware is to blame. YMMV
Click to expand...
Click to collapse
Unfortunately this is the same router with which I am having problems as indicated in my bug report. I've also found at least a few other anecdotal accounts of problems with other Quantenna-based routers as well. The evidence seems to be fairly sparse though, so it's hard for me to draw a meaningful conclusion from what I've seen so far.
For whatever it is worth, I currently have another user with a Nexus 6P on 6.0.1 on my network on that device doesn't seem to have the same issues that I am seeing.
]grimm[ said:
Unfortunately this is the same router with which I am having problems as indicated in my bug report. I've also found at least a few other anecdotal accounts of problems with other Quantenna-based routers as well.
Click to expand...
Click to collapse
Well that's lame. I have had no problems since I got mine. I did get my own cable modem at the same time but don't see any connection there.
I'm guessing we're waiting on an update from Google?
My random disconnects have stopped, but wifi will still randomly shut off/turn back on in my pocket. Even in Safe Mode.
Flashing factory images and factory wiping haven't solved the problem.
Is anyone looking into this?
Edit: Even after the January security patch update, still having these issues.
It seems like my wifi issues have resolved themselves somehow.
FWIW, I was having a similar problem on my Sprint HTC One M8 after upgrading to Marshmallow. The problem happened on every wifi I would connect to... work, home, a friend's place, etc. After trying out several things, I finally fixed it by uninstalling "Sprint Connections Optimizer". I tried disabling it first, but every time I disabled it and went back into the settings, it appeared to still be enabled. So I'm not sure if disabling it was actually working.
To uninstall it, you need to go into "Manage apps" from your apps drawer to find it. I don't think it's listed with an icon in your usual set of stock and installed apps.
Posting this just in case no one has thought of it before, or someone knows something and hasn't spoken up. I have noticed a lot of people mentioning they only have this issue at work, and others who have "changed their router" and stopped the behavior.
I run a Cisco Wireless LAN Controller at home, with multiple APs (Cisco 1252 a/g/n). Typically this gives me better performance and stability than most consumer-grade stuff, but I have to wonder if there isn't a setting on this enterprise-grade stuff that is related to the disconnect issue, or if this is truly simply a Marshmallow bug. This could also be the common link with people who only have this issue at work, their work may be using Cisco enterprise Wireless gear.
I will do some more digging, I did have a spot in my house where my phone would randomly disconnect, turning on "Fast SSID Change" stopped that, so I am hoping there is something that might affect this disconnect while sleeping thing as well. I noticed my WLC reports my phone as being "Power Save Mode ON" in the client info page.
More to come if I discover something.
I have same issue at home, stock Nexus 6p and an AT&T router. Limited Data plan, so it's frustrating to be at home sitting 2' from WiFi router & drop off.
If people might say how they get their log errors & post them to Google, that'd be interesting reading.
I'm 90% sure this is a software bug. My wifi is consistent & always on, iPhones & Note 3, Roku, & PS3 have no problems connecting.
Please Google find this bug & patch it!!! (And while you're at it, re-enable Dark Theme setting!!)
REkzkaRZ. com
Add me to the list of people having this problem. I am between several different locations on a typical week and so far, the Cisco AP's by far have the most issues. In fact at my locations with Ubiquiti AP's, I have a perfect connection with no drops.
I really hope this gets resolved soon as well. Many applications are unusable when the WiFi does its drop and reconnect dance.

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