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ICS WiFi Issue: Possible Fix?

I updated my UK Galaxy Note on Vodafone, yesterday. Immediately encountered a WiFi issue. The connection to my wireless router kept disconnecting then connecting, but sometimes didn't actually even connect. I changed the WiFi frequency band setting (Settings>Wi-Fi>Advanced>Wi-Fi frequency band) from "Auto" to "2.4 GHz only" and this seems to have fixed it. It seems like common sense, but I thought I'd post it anyway as people are having issues with their WiFi on ICS.

kage93 said:
I updated my UK Galaxy Note on Vodafone, yesterday. Immediately encountered a WiFi issue. The connection to my wireless router kept disconnecting then connecting, but sometimes didn't actually even connect. I changed the WiFi frequency band setting (Settings>Wi-Fi>Advanced>Wi-Fi frequency band) from "Auto" to "2.4 GHz only" and this seems to have fixed it. It seems like common sense, but I thought I'd post it anyway as people are having issues with their WiFi on ICS.
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I had a similar problem. I have a cisco linsys router.
Anyway I flashed the latest modem LR1 using PC odin (modem.bin) and things seem better so far.....
http://http://forum.xda-developers.com/showthread.php?t=1645202

Changing Wi-Fi frequency band) from "Auto" to "2.4 GHz only" didn't fix it for me. Strangest thing is i have no problem with wifi at work while it doesn't work at home wifi. Notebooks get connected to internet at home with no problems when my Note connects wifi but only connects to internet for few secs after first time it gets connected. Then it loses connection to internet even though it still shows up wifi is connected. Any clue on that ?

I've noticed I've been having momentary WiFi disconnections ever since I upgraded to ICS.
I'm using MyPhoneExplorer to transfer files wirelessly to the device (not via USB), and ever since ICS it has became an unreliable way to transfer files. If I transfer a big file most chances are that the WiFi connection will drop during the transfer, causing it to fail.
The connection is restored immediately but then I have to restart the transfer process as it halts when the connection fails.
I have excellent signal level (physically located close to the Access Point), I tried flashing the latest modem firmware (XXLR1) - twice, I've set "2.4GHz only" in the WiFi advanced settings, all to no avail: I still get these connection drops.
Has anybody got any information about this problem? Been experiencing similar problems?
Thanks!

[Q] i9505 5ghz WiFi Issue

At home I have a 2.4ghz and 5ghz Wifi network setup.
My S4 is always connected to the 5ghz and has never had any problems. My partners iDevices are also connected to it.
The other day when I got home I noticed that I kept getting the error 'Your internet connection is unstable' and couldn't use the 5ghz if I wasn't directly in front of the router. No settings had changed, no updates etc. It will discover and connect to the network but it won't load webpages or anything.
There is no new firmware for my router, I have tried all the different channels, and have even reset the router, and as a temporary fix I've only been using the 2.4ghz network. My iPad still works fine on the 5ghz anywhere in the house, and my partner has had no issues.
Has anyone else had this problem, or does anyone have a solution?
I'm running the stock 4.3 on the phone as I haven't even tried flashing it.

stuffandthat said:
At home I have a 2.4ghz and 5ghz Wifi network setup.
My S4 is always connected to the 5ghz and has never had any problems. My partners iDevices are also connected to it.
The other day when I got home I noticed that I kept getting the error 'Your internet connection is unstable' and couldn't use the 5ghz if I wasn't directly in front of the router. No settings had changed, no updates etc. It will discover and connect to the network but it won't load webpages or anything.
There is no new firmware for my router, I have tried all the different channels, and have even reset the router, and as a temporary fix I've only been using the 2.4ghz network. My iPad still works fine on the 5ghz anywhere in the house, and my partner has had no issues.
Has anyone else had this problem, or does anyone have a solution?
I'm running the stock 4.3 on the phone as I haven't even tried flashing it.
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did you changed some wifi settings on your phone ??
cos if that happens you have to match the settings same both on pc{ of router } and phone
even if you are sure that you haven't changed anything just make sure and check the settings again

Is there a way to fix wifi stability problems?

After a few hours of use, my wifi will be connected but doesn't transfer data. If I disconnect or shut down wifi and try to reconnect, it won't work. My data plan then takes over. When I reboot the device, it works again. There seems to be a stability problem with my wifi. I'm running stock 5.1.1 rooted. Is there a way to fix this or is it a wear and tear issue that cannot be fixed? Is there a rom or something else that would improve the wifi performance? I have my wifi set only to 2.4GHz band.

Do you have a dual-band router that is broadcasting a 2.4GHz and 5GHz AP with a similar SSID name but different password?
It's a really specific scenario, but for whatever reason, on the stock Lollipop ROM with those conditions, it'll automatically add the other AP and try connecting to it and fail due to the password mismatch, and then kick you to cellular data. Marshmallow doesn't do this.

No, just one signal. I think my phone is the problem because it happens under other wifi routers.

Any version of Android Oreo does not connect to my WiFi router!

I have done all the steps (vendor, radio, bootloader, TWRP all correct) and LineageOS 15.1 boots fine. However, it cannot connect to my home WiFi network.
The reason I went to Custom ROMS is because Google's OTA Oreo update, also had the same problem. So, whatever version of Android Oreo I have, I connect to WiFi, then it goes to a "connecting" state, then "Saved" then "Disabled"! Can someone help me troubleshoot this?! Thanks. If I go back to Android 7.1.2 , WiFi connects fine! This is bizarre. I am using 802.11n with a 300Mbps max BW DLink router.
The error in LogCat is "system_process W/WifiConfigManager: Looking up network with invalid networkId -1"
WiFi Verbose Logging shows "network selection disabled association rejection"

@zetret I went through similar scenario at my Aunt's house. Every time I visited would have to reboot the router. Only then would android Oreo connect. With nougat and that same router no issues. It was older model dlink not even 5ghz connection. If you haven't already try unplugging the router and plugging back in maybe will work for you. Just sucks that Everytime you leave the connection would have to repeat the process. You might have to flash back to android 7.1 until the router gets updated.

Exodusche said:
@zetret I went through similar scenario at my Aunt's house. Every time I visited would have to reboot the router. Only then would android Oreo connect. With nougat and that same router no issues. It was older model dlink not even 5ghz connection. If you haven't already try unplugging the router and plugging back in maybe will work for you. Just sucks that Everytime you leave the connection would have to repeat the process. You might have to flash back to android 7.1 until the router gets updated.
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I have rebooted the router many times - still the same issue, and the router firmware is up-to-date, it's from last year.

If you're using WEP or WPA security on the router switch it to WPA2

hawkswind1 said:
If you're using WEP or WPA security on the router switch it to WPA2
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Thanks, but it is already WPA2.

Android WIFI and router sync issue

*happens only on my J2 Lte but not other devices connected to the same network
While connected to my home wifi router, the internet works fine on my Samsung J2 but when i reboot the router or the router loses internet for whatever reason, my J2 (while still showing wifi is connected) has no active internet connection.
(It does after a couple of hours but an active connection on my devices is needed at all times so cant wait that long)
After my router reboots, i have to manually go to my wifi tile on my device and turn it off and back on and then it connects and works like normal.
Rooted
Android 6.0.1
on5pro stock rom port for j2lte https://forum.xda-developers.com/galaxy-j2/development/on5pro-stock-j2lte-t3792985

Bumping this thread because still havnt found a fix for it.