1. Ron MacRae's Avatar
    My HTC U11+ with Android 9 randomly reboots. It won't happen for weeks then it will do it 2 or 3 times in a couple of days.

    The reboot halts for my encryption pin. I may not see this for several hours and for that time I'm not contactable.

    Is there any way to tell WHY my phone re-booted, so I can fix it?

    Or get it to tell me it's rebooting so I can let it start?

    Thanks,
    Ron.
    08-29-2019 06:40 AM
  2. B. Diddy's Avatar
    That can be tricky to figure out. It could be an app you installed that's causing instability, but since it's pretty infrequent, using Safe Mode would not be an easy way to narrow things down.

    It could be a firmware bug -- you'd have to consider either a factory reset or reinstallation of the stock ROM, but that's a bit drastic (and a hassle), so I wouldn't recommend it yet.

    It could be a hardware issue -- the first thing I'd consider from this standpoint would be a bad SD card (if you have a card inserted). Try unmounting the card and removing it, then see if the reboots keep happening.

    Also try wiping the cache partition: https://support.t-mobile.com/docs/DOC-36638
    08-29-2019 12:36 PM
  3. Ron MacRae's Avatar
    Thanks for the reply.

    I don't have an SD card. Don't need one with 128GB on the phone.
    I've already wiped the cache and done a re-boot.

    It's a pretty dumb Operating system that doesn't record why it's doing a re-boot.
    Sounds like a factory reset is my only option, unless anyone can think of anything else?

    Ron.
    09-01-2019 11:18 AM
  4. mustang7757's Avatar
    Thanks for the reply.

    I don't have an SD card. Don't need one with 128GB on the phone.
    I've already wiped the cache and done a re-boot.

    It's a pretty dumb Operating system that doesn't record why it's doing a re-boot.
    Sounds like a factory reset is my only option, unless anyone can think of anything else?

    Ron.
    It's tough if issue doesn't after awhile, I'm thinking go with factory reset and go from there.
    09-01-2019 11:35 AM
  5. B. Diddy's Avatar
    The other option is to uninstall most (if not all) of your apps and see if the problem persists. You could probably keep very common and well-established apps installed at this stage of troubleshooting.
    09-01-2019 06:45 PM
  6. Ron MacRae's Avatar
    Factory reset didn't remove encryption, which I hoped would resolve my issue by allowing my phone to reboot when it failed. However I'm still quietly being prompted for a password at startup.
    10-28-2019 06:13 AM
  7. Mike Dee's Avatar
    It's tough if issue doesn't after awhile, I'm thinking go with factory reset and go from there.
    I wonder if reinstalling the firmware would eliminate the problem. If it's hardware though that won't solve anything.
    10-28-2019 06:35 AM
  8. mustang7757's Avatar
    I wonder if reinstalling the firmware would eliminate the problem. If it's hardware though that won't solve anything.
    You can definitely try this or see if can get warranty if still is one just so time doesn't go on and miss out on exchange the phone if that doesn't solve it .
    10-28-2019 09:43 AM
  9. Ron MacRae's Avatar
    I wonder if reinstalling the firmware would eliminate the problem. If it's hardware though that won't solve anything.
    I've already done a factory reset. Encryption is still active. I didn't get asked if I wanted encryption, it just re-installed it.
    10-29-2019 08:42 AM

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