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[Android 5.1] Random reboots.

Good afternoon gents!
This is the first time I post on this forum so I apologize in advance if I am not going to provide all the details regarding my problem. I'll try to be as explicit I can with my issue.
A couple of weeks ago I bought a LG Nexus 5, second hand. After one day of use the device started to randomly reboot. The odd thing is that the reboots seem to be "soft". After the device restarts there is no data loss, even the recent apps are still there. The reboots are as random as I can get, when browsing with Chrome, checking emails, or playing a game.
I tried several fixes, including costum kernels, costum ROMs and so. The problem persisted with the official KitKat 4.4.4 and Lollipop 5.0, 5.0.1 and 5.1.
Currently I am running stock Lollipop 5.1 with stock kernel and TWRP 2.8.5.2 recovery and the device is rooted.
Below I attached a screenshot with the device's current configuration and a text file with the kmsg log from the last reboot.

Faulty power button.
Reboot phone into bootloader/fastboot.
If it random reboots in the bootloader too, it's likely the power button.

Nope, I already tested this. The device reboots during use, either heavy or simply browsing the menu.
Sent from my Nexus 5 using XDA Free mobile app

I noticed this in your Log
"<6>[ 0.514020] [email protected]: Power-off reason: Triggered from UVLO (Under Voltage Lock Out)"
Just curious, Are you undervolting?

I don't know exactly what undevolting implies. Could you give me more details please?

vektor1993 said:
I don't know exactly what undevolting implies. Could you give me more details please?
Click to expand...
Click to collapse
Lowering the voltage the CPU runs at, at certain frequencies.

I understand. No, I did no change any of the voltages. In that log that I posted up there the device is rooted and has TWRP 2.8.5.2 with stock lollipop 5.1 and stock kernel. Later yesterday evening i installed xtrasmooth rom with franco kernel and the phone only restarted in Here Maps from Nokia. I'll run more tests, but from this I draw the conclusion that it is a software problem, not a hardware one. Unfortunately I can't RMA the phone. Do you lads have any other opinions?

vektor1993 said:
I understand. No, I did no change any of the voltages. In that log that I posted up there the device is rooted and has TWRP 2.8.5.2 with stock lollipop 5.1 and stock kernel. Later yesterday evening i installed xtrasmooth rom with franco kernel and the phone only restarted in Here Maps from Nokia. I'll run more tests, but from this I draw the conclusion that it is a software problem, not a hardware one. Unfortunately I can't RMA the phone. Do you lads have any other opinions?
Click to expand...
Click to collapse
Try posting another log if it happens again.

I'm back with the latest ksmg log here. I searched for fixes all over the internet and nothing seemed to fix the problem. Restarts also occur in safe mode. Below is the latest last_kmsg.

vektor1993 said:
I'm back with the latest ksmg log here. I searched for fixes all over the internet and nothing seemed to fix the problem. Restarts also occur in safe mode. Below is the latest last_kmsg.
Click to expand...
Click to collapse
This log shows a kernel panic.

My n5 reboot today without any reason

That was the only thing I understood from the log too. Do you have any idea what's the reason for these kernel panics and a possible way to fix them?

I experienced today three more random reboots. I attached down the logs. As an unexperienced users point of view all of them are produced by a "Unable to handle kernel paging request at virtual address" . Could anyone throw a look on them and give me a possible reason for these reboots and a possible fix? Thank you in advance

vektor1993 said:
I experienced today three more random reboots. I attached down the logs. As an unexperienced users point of view all of them are produced by a "Unable to handle kernel paging request at virtual address" . Could anyone throw a look on them and give me a possible reason for these reboots and a possible fix? Thank you in advance
Click to expand...
Click to collapse
Same problem as this guy
http://forum.xda-developers.com/showpost.php?p=59551481&postcount=8615

having the same problem. i'm running 5.1, but dont know if it's caused by that, cause i just got this phone as a refurbished one from google.

Good day lads!
I tried since the last post more possible fixes, and the only thing that showed some resuslt was downgrading to 4.4 bu the device still resarts exactly once a day. I am going to switch to another phone.
having the same problem. i'm running 5.1, but dont know if it's caused by that, cause i just got this phone as a refurbished one from google.
Click to expand...
Click to collapse
If you just recieved a new device and you have the possibility to RMA it, I suggest doing it. I went as far as page 30 on google searching possbile fixes and came up with no valid result.

Random Reboot on Lollipop 5.1

Hi, I've got some random reboots after upgrading on stock Lollipop 5.1 on my Nexus 5.
I've used Android 5.0.1 without any reboots or problem, but after upgrading on 5.1 I'm facing many random reboots when I switch from an app (like a game or Hangouts) using Recents or Home button from NavBar (it also happens randomly when I'm using my phone, like writing a message on Hangouts).
The reboots I'm talking about are not "soft" but "hard", because bootloader's logo (Google) appears and restarts my phone, so it is caused by Kernel Panic (as you'll see in my last_kmsg) and they occured on both stock and custom rom.
Here is a "last_kmsg" when it occured on stock Lollipop 5.1: http://pastebin.com/80dDgzae (attached too).

The_Wolf91 said:
Hi, I've got some random reboots after upgrading on stock Lollipop 5.1 on my Nexus 5.
I've used Android 5.0.1 without any reboots or problem, but after upgrading on 5.1 I'm facing many random reboots when I switch from an app (like a game or Hangouts) using Recents or Home button from NavBar (it also happens randomly when I'm using my phone, like writing a message on Hangouts).
The reboots I'm talking about are not "soft" but "hard", because bootloader's logo (Google) appears and restarts my phone, so it is caused by Kernel Panic (as you'll see in my last_kmsg) and they occured on both stock and custom rom.
Here is a "last_kmsg" when it occured on stock Lollipop 5.1: http://pastebin.com/80dDgzae (attached too).
Click to expand...
Click to collapse
Flashed Android 5.0.1 and no random reboots (as I also said when i wrote my first post).
I don't know if the "question" is clear, but can you help me reading the "last_kmsg" which I attached in first post? Thanks

Same exact thing happening to me also.
Sent from my Nexus 5 using XDA Free mobile app

The same is happening to me. And it looks like a hardware problem cuz when the phone reboots it keeping reboot until I keep pressing the power button while boots.
I have a bad experience about it. In my Nexus S when updates to Jelly Bean the same occurs until phone suddenly die. (I live in Brazil so, guess what? I have now a wonderful paper weight)

No luck with 5.1.1
You guys found any fix?
I was waiting for 5.1.1 update from Google (5.1.1 code is already available on AOSP and I tested it on Chroma), but unfortunately it didn't solve this problem: it keeps rebooting after a long daytime doing the same things I already wrote in first post. I'll wait for factory Google factory images, but I'm pretty sure it won't fix this.
P.S.: I tested Chroma on 5.0.2 bootloader and modem.
Anyone can read "last_kmg" I posted in first post? Any other has the same trouble?

The_Wolf91 said:
You guys found any fix?
I was waiting for 5.1.1 update from Google (5.1.1 code is already available on AOSP and I tested it on Chroma), but unfortunately it didn't solve this problem: it keeps rebooting after a long daytime doing the same things I already wrote in first post. I'll wait for factory Google factory images, but I'm pretty sure it won't fix this.
P.S.: I tested Chroma on 5.0.2 bootloader and modem.
Anyone can read "last_kmg" I posted in first post? Any other has the same trouble?
Click to expand...
Click to collapse
Try another (custom) kernel.

beekay201 said:
Try another (custom) kernel.
Click to expand...
Click to collapse
I just flashed ElementalX kernel but no luck, random reboot happened on 5.1.1 too. By the way it was quite obvious because it happened already on 5.1 Google's factory image (stock kernel so)..

I have exactly the same issue with nexus 5 since upgrading to 5.1.0.
I went back to 5.0.1, which solved it for a few days, but now this happens with 5.0.1 as well.
also, before random reboots happen, the power button becomes extra sensitive, so one keypress causes the screen to turn on and off again, or to display the shutdown menu.
this does not happen when the phone is stable.

Hey guys i have the exactly same problem since i upgraded to 5.1.1 i am non-rooted please need help
Sent from my Nexus 5 using XDA Free mobile app

noob424 said:
Hey guys i have the exactly same problem since i upgraded to 5.1.1 i am non-rooted please need help
Click to expand...
Click to collapse
Same here.
LG Nexus 5 - Lollipop 5.1.1 LMY48B
Unlocked bootloader;
Rooted;
ClockWorkmod 6.0.4.5 (not flashed - just boot on image when used);
Wipe factory reset (in cwm). Flashed 5.1.1 image files (boot, radio, bootloader, system and cache).
Random reboots, and sometimes with apps optimizing.

I have the same problem with N5 since upgrading to 5.1.1 - never had any problems before. Doing it several times an hour now. Trying a cache clean next, after I wait for the optimising apps to finish yet again!

Hi all,
I had the same problem. Everything stock, up to datę, no root. Phone was rebooting itself several times in a row.
Right now it seems that problem dissapeared. Reboots in my case was caused probably by application Autoguard Dash Cam Blackbox. After removal no reboots for 2 months and no memory leak.

cleared cache and it happened again within a minute...
Does seem to be linked to the power button

There's a long thread about this issue over at Google Groups. It's affecting a lot of users and not just Nexus 5 users. Some in the thread are 4 and 7 users having the same issue. Some have replaced the battery and it has resolved the issue, at least temporarily. Others, like myself, saw success in rooting and replacing the kernel or using a new ROM. Users who have downgraded to Kit Kat report the issue goes away, so despite the power button triggers, it seems to be a software issue. Anyone have any insight? It's getting feisty in Groups thread.
Google Groups reboot thread

simbapenn said:
There's a long thread about this issue over at Google Groups. It's affecting a lot of users and not just Nexus 5 users. Some in the thread are 4 and 7 users having the same issue. Some have replaced the battery and it has resolved the issue, at least temporarily. Others, like myself, saw success in rooting and replacing the kernel or using a new ROM. Users who have downgraded to Kit Kat report the issue goes away, so despite the power button triggers, it seems to be a software issue. Anyone have any insight? It's getting feisty in Groups thread.
Google Groups reboot thread
Click to expand...
Click to collapse
I have N5 kit kat 4.4.2 in Chrome watching videos randoms reboot its happens

This is happening to my fiance's N5. It happens when she's using it and also when it's not being used. When it reboots, it optimizes the apps and says the battery is at 0 when it was a full charge. Only way to turn it back on is to connect it to a charger. Frustrating.

FYI the update to 6.0 did not solve the restart problem. It's either hardware related, app related or a bug that's still in the OS.

I'm selling my Nexus because of this, has been happening for a few months now.
It's not software related, it has to do with the actual power button. Some people had success changing it out, soldering it etc., but I don't have that time or knowledge.
Google wouldn't help, as I'm out of warranty. So I guess it's goodbye Nexus. Really unfortunate given that the phone works fine, it's just a quality issue.. will have to re-evaluate buying another Nexus in the future.

The_Wolf91 said:
You guys found any fix?
I was waiting for 5.1.1 update from Google (5.1.1 code is already available on AOSP and I tested it on Chroma), but unfortunately it didn't solve this problem: it keeps rebooting after a long daytime doing the same things I already wrote in first post. I'll wait for factory Google factory images, but I'm pretty sure it won't fix this.
P.S.: I tested Chroma on 5.0.2 bootloader and modem.
Anyone can read "last_kmg" I posted in first post? Any other has the same trouble?
Click to expand...
Click to collapse
Im getting them as well on 5.1.1. I hope its fixed in the 6.0 ota update.
---------- Post added at 04:41 PM ---------- Previous post was at 04:20 PM ----------
I have been using this awesome app on my nexus 5, just so I don't have to use the power button here is the play store link.
https://play.google.com/store/apps/details?id=com.plexnor.gravityscreenofffree

maccboy2010 said:
Im getting them as well on 5.1.1. I hope its fixed in the 6.0 ota update.
Click to expand...
Click to collapse
Confirmed the update will NOT fix this issue.

constant force closes [huawei y511]!

hi, in the past I had a huawei y511 and because I had this problem I've changed my phone now, but I want to fix it. plz help me.
Previously I could root my phone easily using framaroot 1.8, and I tried to root my phone to do some things then after things got ok, I unrooted it and this was done several times, but the latest time I wanted to root, it didn't allow me and I installed framaroot 1.9 and rooted successfully. but the problem started from here, after a couple of days, constant force closes came and without any they started force closing, clicking ok and the next one was there! sometimes restarting could fix my problem but in some situations restarting the phone was not the solution and I was made to enter recovery mode to full wipe, then everything could get ok again! firstly I thought the problem is from updated gaps, so I tried keeping them outdated to see if it was relating to this, but no nothing changed, although no apps was updated, these errors came again! I even flashed my phone (but I hadn't unlocked it's bootloader) to the stock rom to see if it could fix but NO, even in this rom problem existed and already exists! I googled a lot but couldn't find any working solution so i ask my question here! I do not know that may either unlocking bootloader or just installing a custom rom fix my problem?!?!?! plz help me this is really annoying!
HUAWEI Y511-U30, BB118
PLZ PLZ PLZ SOMEONE HELP!

SM-N920p Keeps rebooting after root on marshmallow . Have i bricked my phone?

Hello all. I am from the UK and recently purchased a sprint model phone. I wanted to remove handsfree activation. In order to do that i need a root. I rooted 5.1.1 with kernel SpaceX-Kernel-v0.1_N920P(official).tar and all seemed ok. Then i noticed that you could root marshmallow. I followed a tutorial on youtube and flashed two files through twrp no-verify-opt-encrypt.zip and SuperSU zip. I rebooted the phone and now i have a persistent problem. After around 15-30 seconds my phone shuts off and reboots itself. I have tried reflashing stock roms and the problem still persists. I have no idea if i have broken the phone as its usable until it shuts off . I went into the about phone section and it tells me the baseband and software versions are unknown aswell. Is there anyway to recover this?

Known issue. Drain battery until it is dead and charge again.

tdunham said:
Known issue. Drain battery until it is dead and charge again.
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Click to collapse
Thank you very much for responding. That has solved the issue completely! Using MOAR rom on 6.0.1 with no issues. Thanks once again!

Problems with my Xiaomi Redmi 8A

Hello people of XDA Forum,
Since a couple of years I own a Xiaomi Redmi 8A, which I ordered brand new on AliExpress.
After a couple of failed attempts to install a Custom Rom on the device, I still have an unlocked bootloader
and a "offical" stock firmware on the smartphone installed. Sadly now occurs an other problem,
frequently the screen "freezes" when I want to use the touchscreen. Sometimes when I put the power-button
and pressing it another time the screen responsed to it. But not always, it's getting very frustating when
for example I play "Call of Duty Mobile". My question is that I want to know of the problem is software-
or hardware based? Hopefully you can help me out, thnx

Have you modified anything in your device recently? No? Then it's probably hardware issue.
Do you have any damage to your phone? Then it's even more likely to be hardware issue.

XDHx86 said:
Have you modified anything in your device recently? No? Then it's probably hardware issue.
Do you have any damage to your phone? Then it's even more likely to be hardware issue.
Click to expand...
Click to collapse
Thanks for the reply. Now I have this problem for a couple of weeks sadly... There is no visible damage on the
device, but I have dropped the smartphone a couple of times out my hand... So I have this problem and I thought
that a firmware upgrade might help me out, but the problem still remains.

TrippyBlade said:
Thanks for the reply. Now I have this problem for a couple of weeks sadly... There is no visible damage on the
device, but I have dropped the smartphone a couple of times out my hand... So I have this problem and I thought
that a firmware upgrade might help me out, but the problem still remains.
Click to expand...
Click to collapse
If you think the damage to your phone is significant enough for it to affect your screen then maybe you should send it for a checkup.
Although you can try using different ROM to test if it works since it's probably much cheaper to do so than fixing the screen.
But don't flash an OTA update, flash latest stock ROM manually or flash a custom ROM. That way the settings are reset, you can backup your data with TWRP.

XDHx86 said:
If you think the damage to your phone is significant enough for it to affect your screen then maybe you should send it for a checkup.
Although you can try using different ROM to test if it works since it's probably much cheaper to do so than fixing the screen.
But don't flash an OTA update, flash latest stock ROM manually or flash a custom ROM. That way the settings are reset, you can backup your data with TWRP.
Click to expand...
Click to collapse
Allright, thank you very much for the suggestion. Finally I managed to flash an older Fastboot ROM through
the "MI Flash Tool", which solved my touchscreen problems.