[Q] Cell signal shuts off when i start using my phone - Nexus 4 Q&A, Help & Troubleshooting

Hi all, I have a strange issue with my N4.
When I switch the screen on and start playing with the phone the cell signal completely shuts off after a few seconds, if I stop using it it will come back on. The other radios continue to work fine.
The battery in my phone is terrible and only lasts a few hours, would it be possible that it is the issue? Has anyone else experienced anything similar?
I've been running standard CM11 M releases and have only recently started having this issue.

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Random Shutdown

When my phone is sitting idle (screen off) it will randomly decide to power itself off. Has anyone else noticed this? Any ideas on what could be causing it?
The Balvenie said:
When my phone is sitting idle (screen off) it will randomly decide to power itself off. Has anyone else noticed this? Any ideas on what could be causing it?
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you mean randomly power itself ON, right?
if that is the case, it's normal, it just mean it woke up to connect to the internet, to get updates of news, emails, or whatever it was scheduled to pick up
nope. i mean it randomly turns itself off. this topic is being discussed over on the att captivate galaxy forum section.
interesting, so it's going from stanby mode, to complete OFF... nope never seen that happen to my i9000 model
yep totally powered off... completely sucks... looks like there are a bunch of ppl that have this issue with the captivate on att. $10 says its some lame piece of software that att puts on your phone that's causing the problem.
it's possible, i've read here a few users having crazy power issues (battery draining very fast) with their SGS i9000, but after wiping it out clean, to start anew, then the power problem is gone away.
so yes, a software could cause something weird like that.
Factory reset and so far so good
Hey guys,
I use a Galaxy S here in Hong Kong and I had the same random shut down issue constantly happen when my screen went off...
I tried everything, check temperature of cpu, etc. etc. and nothing worked, it just got worse and worse.
I even changed the battery to use the spare one that came with this. Still problematic.
Used SET CPU to limit the cpu to 400mhz, still problems.
Finally I did a factory reset and so far so good.
I only have the original system installed with the Remember the Milk app installed.
24 hours, no problems.
Installed AppBrain app.
Then I installed 3G WatchDog
12 hours, no problem.
Then I installed Paperdroid
12 hours, so far no problems at all.
If I run into an issue I'll post it here. But I think it definitely was a software issue.
Update - it randomly shut down on me
Alright guys, it shut down on my randomly today in the afternoon......
I dont know if it's the re-charging that screwed it up?
Because after my factory reset, last night was the first time i charged it....
Hmmm
This happened to me too - two days in a row until noon it would shut down two or three times - i uninstalled SetCpu and for now (24 hours) it hasn't happened again. I am not sure if it was the one responsible but it started happening after i installed two programs and i uninstalled them after it started happening. I uninstalled Visual Task Switcher first but on the next day it turned off again, then i unsinstalled SetCpu and it hasn't happened again - maybe some wrong profile settings but i didn't feel like experimenting
I had this issue once too in about 40 days.
I was reading an sms and then i turned into standby and put it in my pocket. Later, maybe 40 minutes i came home and my phone was completely off. I do not remember if i had to take out the battery before to get it on again.
I was wondering why it happened. Maybe it was caused by an app i had opened. Battery still was at 40%.
But since it only occured once in 40 days i doesn´t bother me.
Interesting you mention this as it just happened to me today for the first time. I took it out of my pocket and wtf? The phone was off. Very strange... Using the i9000 on the stock Eclair rom.
Should send back for warranty
Sent from my GT-I9000 using XDA App
software clash?
Well the phone suddenly switched off for me, but this time I turned off APPBRAIN and so far so good.
In fact, I came across an app called NoLED and since it kind of keeps ht phone on, while I have it on my desk, I'm able to be notified of stuff and so far with that, the phone hasnt' shut off.
I'm still experimenting with what works, but try turning off AppBrain and see if you still have the random shut off issue....
i use app brain all the time to keep my apps in sync
not the cause of the problem, that's for sure
my phone can last a whole day even with app brain running
OP, do you have MSN Talk installed on your phone? I have this same problem, seems to happen more when I am running MSN talk in a low signal area.
«try a new sim card. «Could be faulty. «i am on my 3rd phone and all of them had this same problem. «i bought a new sim card 4 days ago, and hasnt happened since. «but then again, this problem usually happens to me once every 3rd-5th day anyways, so i dont know if i am in the clear yet.
Me too, shutdown everyday
Hi guys
After upgrade OS to I9000ZSJG4, Phone random shutdown everyday.
Yep still shuts down
Tried keeping AppBrain off, still shuts down.
Used NoLED so the screen kind of stays on, still shuts off..
So far shut off on me after 40 hrs... this is really stupid.
I am this close to taking it back, but I genuinely think it's a software issue than a hardware issue...sigh
Anyone have any luck figuring this out?
Same problem no solution yet
Hi
I too have the same problem, haven't found any solution yet.
The temperature etc is all good, there is no pattern in shutdown issues.
I have tried factory reset and no new application, it still shut down while using in built browser.
I had the same thing happen to me while skiing in Whistler last weekend. It died twice. I attributed it to the cold. I normally use a 3000mah battery up there, but left it back the house that day. Afterwards while charging in the car and even charging it at home it died prematurely again. It was the eBay aftermarket variety 1500mah knock off. I have since changed back to the Samsung OEM battery. I haven't had an issue with it since. My assumption is that the knock offs in my case cannot handle the heat cycles of charging and then the cold as well as the original. Or they have a limited lifespan, well below OEM specs. I am now only using the 3000mah battery on the weekends to hedge my bet on the quality of manufacture, as it seems to be from the same factory as the 1500.

Cell Standby

So for the past week and a half my G2 battery started draining super fast and it seems that the cell standby is the problem.
If I reboot the phone and have it on for 10mins cell standby time will show time on being 20mins. How is it searching for a signal an extra 50% of the time when it hasn't been on?
Also it will show that I have been without a signal for 50% of the time the phone has been on when I've never lost signal at all.
So the point of this thread is to see if I have a defective device so I can get it replaced. If anyone can help me out and post their Cell Standby times and Time Without signal percentages after a reboot and/or after a days use I'd greatly appreciate it. Thanks.
I'm glad I'm not the only one that had that problem. I had literally the EXACT same problem you are having, and exchanging my phone for a new one fixed it. My cell standby with that phone was in upwards of 79% and averaged 50% without a signal according to that screen. The new phone sits anywhere from 14-40% cell standby, and although there is definitely something wrong with how the radio on this handles signals, I don't get dropped calls anymore and it spends 0% of the time without a signal.
Another problem I had, and am still having, is that data connections just drop with no warning and I have to either wait forever for it to figure it out (there are no indicators of this status in the task bar, however nothing data wise will load) or put in in and out of airplane mode to reestablish a connection. I know plenty of others who have this issue as well and wonder if you do too.
Sent from my T-Mobile G2 using XDA App
I did some checking around with other people that have Android phones as well (not just the G2) and they do not have this problem either. The good news is T-Mobile is sending a replacement because this unit is in fact a defect. Thank you Gwanatu for posting.
Guys, can you tell me how to see this cell standby info? I got mine yesterday and the disconnects are starting to irritate me. Behaves identically to my Nexus, up arrow stays for a looong time, up to a min until it starts receiving data.
Still agonizing about replacing my Nexus, so if these disconnects are a G2 "feature" as well, then I'll just go back...
Thanks
Sent from my T-Mobile G2 using XDA App
fosormic said:
Guys, can you tell me how to see this cell standby info? I got mine yesterday and the disconnects are starting to irritate me. Behaves identically to my Nexus, up arrow stays for a looong time, up to a min until it starts receiving data.
Still agonizing about replacing my Nexus, so if these disconnects are a G2 "feature" as well, then I'll just go back...
Thanks
Sent from my T-Mobile G2 using XDA App
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Settings>About Phone>Battery Use>Cell Standby.
A T-Mobile rep told me they are using new/different type sim cards for smart phones and that could be a possible issue if you are using an older one. Mine was about 5-6yrs old.
My cell standby is at 58% and time witout a signal is 50%...
Did a quick google search and found the airplane mode trick
1. Plug in phone charger
2. Put phone in Airplane mode
3. Put phone to sleep for a minute
4. Turn off airplane mode
5. Unplug phone
I did this and now my cell standby is at 14% and time without a signal is at 3%
fwiw my cell standby is 21% since last reboot days ago.
I do not have php and it is well past 15 days...airplane trick no longer works...still sitting @ 41% cell standby...don't know what else to do
Sent from my T-Mobile G2 using XDA App
Does any one think a factory reset and training the OS would help?
Sent from my T-Mobile G2 using XDA App
ive noticed the cell standby % being higher than it was on my nexus one. cell standby is typically the highest % item in my battery use list (my nexus was always the damn screen sucking up power). if i click it it shows the % time without a cell signal. for me, its always been 0% whenever i check so im not losing signal ever it seems. my battery life is actually quite awesome with this phone so it doesnt seem to be affecting anything really. maybe it has to due with the fact that this phone's SoC is a smaller fabrication and more efficient? that might make other stuff appear to use more power compared to older phones that had less efficient SoC's. just a thought
I just in stalled Screebl lite app. Basicly keeps the phone from going off. Once installed my cell standy by went from 37% to 12%. Can any one else confirm the same results?
Sent from my T-Mobile G2 using XDA App
My cell standy was running at 60+% with no signal running 50%. I did the online chat with Customer Care, and she ended up saying they were going to replace the phone. Funny part is that during the troubleshooting, I pulled the battery for a few minutes, and since then, cell standby has been 39%, with 0 lost signal time. I don't know what that did, but battery life has increased a ton. And a replacement is on the way...may try it for a few days, but this is working fine, so not sure I am going to exchange.

[Q] Phone won't wake up/black screen

Hey guys, been having an issue on my N4 since I installed lollipop. It seems that leaving bluetooth turned on is causing my phone to have the SOD or not wake up. Notification light will still flash, but screen won't turn on. The only thing to do is hold the power button down to force a reboot. I have seen this happen on my wife's N4 also so its not just my phone. I have left bluetooth off and the phone has stayed on for over a week. But after turing BT back on and using a bluetooth device (handsfree earpiece) with in a few hours this issue crops up.
I even restored my phone completely back to stock and am still seeing this issue. You can check the battery stats after the reboot and it shows it kills the cell modem, but the only thing that stays powered is the wifi, but the battery part of the screen shows like the phone is off.
I haven't tried leaving bluetooth on and having wifi off, but something is screwing it up. I was hoping the update to 5.0.1 would fix this since we got an updated kernel, but its still happening.
anyone else seeing this? surely I can't be the only one seeing it on my 2 phones.....
In fact I just experienced this this morning. The only difference is my phone appears to have locked up during the night and my alarm never went off which caused me to be late for work. I also don't have my Bluetooth on, only WiFi.
Sent from my Nexus 7 using XDA Free mobile app

Nexus 4 radio issues, battery issues, constant reboots

I purchased my nexus 4 on release from the Google Playstore (UK) over 2 years ago now, recently updated it to stock 5.01 and have been bombarded with problems.
When using the phone, after about an hour of use it will suddenly ask me to re-input my sim card pin (I'm assuming this is a radio issue). After doing so, more often than not the phone will then just shut down - sometimes with a screeching noise?! At this point the battery still has around 50-60% left, when I then turn the phone on again, the battery suddenly drops and I usually see the figure to around 1-10%. This has required me to charge the phone 2-3 times a day in order for it to function, extremely annoying that the radio seems to fail and not pick up any network signal after the phone drops past 60% battery.
I've attached an image of my battery life to show what I mean about the drop - it's quite frustrating as I've looked after the phone extremely well so I can't understand why these problems are occurring.
Any help would be much appreciated!
ri$h said:
I purchased my nexus 4 on release from the Google Playstore (UK) over 2 years ago now, recently updated it to stock 5.01 and have been bombarded with problems.
When using the phone, after about an hour of use it will suddenly ask me to re-input my sim card pin (I'm assuming this is a radio issue). After doing so, more often than not the phone will then just shut down - sometimes with a screeching noise?! At this point the battery still has around 50-60% left, when I then turn the phone on again, the battery suddenly drops and I usually see the figure to around 1-10%. This has required me to charge the phone 2-3 times a day in order for it to function, extremely annoying that the radio seems to fail and not pick up any network signal after the phone drops past 60% battery.
I've attached an image of my battery life to show what I mean about the drop - it's quite frustrating as I've looked after the phone extremely well so I can't understand why these problems are occurring.
Any help would be much appreciated!
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To be honest, they all sound like gremlins from old data left in the partitions from the previous OS versions. I am on 5.0.1 and experienced none of those issues, in fact, it runs like butter. I would suggest a full wipe and see if that fixes the issue. Residual data can cause these sorts of random issues.
OP I have the issue with radio after a fresh factory image install. I have signal but cellular data will stop flowing. This is intermittent. Switching to airplane mode sometimes fixes the problem, but sometime I have to reboot. Considering going back to KitKat.
If you using android 5.0.0-5.0.1 - this can be android bags. i have this too it make me crazy!
I managed to get round to rebooting today (had exams lately so literally no time to sort the phone out). Did a factory reset and still the same issues, in fact it's gotten progressively worse since the last time I posted, battery cuts out at around 80% (switched off today at 87%). I get about 40 mins on screen time and bam, shuts down, I'm able to switch it back on in a minute or two, where I then see it down to about 15%. The fact that it's continuously asking me for my sim card pin is insanely frustrating, even more so when it shuts down RIGHT after i put it in.

MX4 Pro - network cuts off and battery suddenly drains to zero

I wonder if anyone can help me...I have an MX4 Pro, with the latest firmware (Global version, Flyme 5.1.12.0G), and I've been having a few issues.
For some time I've had an issue where the network cuts our if I am using mobile data. Sometimes it's OK, but other times the signal suddenly shows zero bars. If I reboot then it works, at least for a bit. This is not due to a poor signal. It has happened sporadically for a while and not just on this latest firmware.
Now, when this happens the battery suddenly drains. I can literally see the battery reading go from 45%, or whatever it is, to zero in a few seconds. The phone then shuts off. Last time it did this I plugged the power it (otherwise it wouldn't re-boot) and when it did come on, just seconds later, the power was back at 45%. So, I don't think it's simply a bad battery issue.
I also have had a power drain with a GPS app, in that the battery was almost full (and it really was) thought the app drained the power in no time. At other times, it works as it should. Other than this, the batter has only suddenly drained when the network signal has been lost.
I have tried to remove the sim and plonk it back in after a reboot, and I have "updated" with the same firmware. The issue still persists though.
Any hints would be much appreciated!

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