topic Re: lollipop sudden reboot, major bug? in Z Series

lollipop sudden reboot, major bug?

andy1 — Mon, 04 May 2015 08:51:48 GMT

My Z Ultra was all good untill few days ago it suddenly shut of and reboot itself, not once but one after another. Although its not frequent but I can never expect when will the phone reboots again. I've tried resetting and ran the device in safe mode and it even rebooted in safe mode, this problem still occurs after I did a pc companion repair. Please help me out here!

Re: lollipop sudden reboot, major bug?

Hampus — Mon, 04 May 2015 10:08:01 GMT

Hi,

Perhaps it can be related to your SIM and/or SD-card. If you are using an SD-card, could you try to use it without the SD-card for some days to see if same thing occurs? Regarding the SIM-card, you can try another SIM-card or order a new SIM from your network provider.

Re: lollipop sudden reboot, major bug?

toothpaste — Mon, 04 May 2015 15:45:16 GMT

if the sim has problems, shouldn't the system notify of the failure and also fail gracefully, instead of randomly rebooting?

Re: lollipop sudden reboot, major bug?

andy1 — Tue, 05 May 2015 04:10:52 GMT

In terms of faulty sim card, could it be the phone not detecting the sim card causing the phone to reboot by itself? I have taken my sim and sd card out and will see how it goes.

Re: lollipop sudden reboot, major bug?

toothpaste — Tue, 05 May 2015 07:36:31 GMT

if the phone fails to communicate with the sim card, it generally loses signal and says something along the lines of "emergency calls only"

the phone rebooting or hanging means something is very wrong.

i suspect something has to do with a watchdog timer, but still, it shouldn't be rebooting the phone without any kind of warning or

if it is rooted you can do a dmesg, or leave a script running (locally or via adb) to collect dmesg and/or other log data and maybe see if something pops up in there.

Re: lollipop sudden reboot, major bug?

Hampus — Tue, 05 May 2015 08:21:18 GMT

If the SIM-card is removed or loses its connection, the phone should display the message "SIM card removed, restarting" and then the phone will restart. So a faulty SIM-card, can cause this behaviour.

Re: lollipop sudden reboot, major bug?

andy1 — Tue, 05 May 2015 08:54:21 GMT

I also forgot to mention that if I want to perform normal shut off, after a random reboot, the phone will just go to a black screen but not completely shut off and it didnt even vibrate, I can still see the panel lit, then the phone goes completely black and after a few seconds it reboots itself up!

Re: lollipop sudden reboot, major bug?

andy1 — Tue, 05 May 2015 09:00:25 GMT

Yeah my phone never showed it, it.just went bam! Shutoff and reboot. No its not rooted.

Re: lollipop sudden reboot, major bug?

toothpaste — Tue, 05 May 2015 12:33:45 GMT

That behavior is kinda unwanted.

I can't imagine my pc **bleep** its pants and rebooting without any warning or option to delay it, just because i removed a wifi dongle, or just because the ethernet cable came loose...

Re: lollipop sudden reboot, major bug?

andy1 — Tue, 05 May 2015 20:53:28 GMT

@toothpaste rebooting once is alright but rebooting multiple times unpredictably is **bleep** annoying

Re: lollipop sudden reboot, major bug?

andy1 — Wed, 06 May 2015 10:00:14 GMT

This reboot happened again while I was watching YouTube, seriouslo it's annoying as, does anyone know what's up

Re: lollipop sudden reboot, major bug?

Hampus — Wed, 06 May 2015 12:18:21 GMT

Did this happen now, when you did not have your SIM/SD-card inserted?

Re: lollipop sudden reboot, major bug?

andy1 — Thu, 07 May 2015 06:04:21 GMT

Sorry for late reply keep getting error 403. I was using it last night in YouTube and it suddenly rebooted. I had the sim and sd card in all day and it's fine until that reboot.

Re: lollipop sudden reboot, major bug?

toothpaste — Thu, 07 May 2015 08:02:59 GMT

try it for a day or two WITHOUT sim card and WITHOUT sd card

yes, it is very annoying, but i suggest you try it.

Re: lollipop sudden reboot, major bug?

andy1 — Thu, 07 May 2015 08:10:10 GMT

Yeah I will do it in the weekends and see how it goes. Thanks for the help!

Re: lollipop sudden reboot, major bug?

andy1 — Sat, 09 May 2015 23:18:39 GMT

I got a video to show the problem, not sure if it will help. This is when my sim card is inserted, once I removed my sim card it did not reboot so I think it might by my sim. https://youtu.be/apiLb4H1ZS0