I have the very same issue - at least the error message is exactly the same - but for me I can:
- use the phone just fine as my primary user
- reproduce the crash 100% of the time by switching to any other user on the phone; after a few moments I get the error message “Factory data reset” and “restarting…”.
However:
- I have an FP3
- for me it started about 2 weeks ago and I haven’t done anything that I wouldn’t normally do when the crash happened the first time.
To the questions of @yvmuell :
- my SIM card is maybe 4 months old; I just removed it but the issue stayed the same.
- I use an SD card for many months, formatted with exfat by the “add SD card” wizard; I just ran chkdsk /R (locate bad sectors) but all looks good.
- Not sure how to do a backup that could be restored after a factory reset, but if all else fails, the factory reset will likely be my only option.
- I added the bug report shortcut to the power button menu for the primary user; I’m guessing the secondary user can’t be a developer. And now what?
The only observation that may or may not be helpful is that the phone was really getting sluggish in the month(s) before, especially when using the second user. I got “system UI is not responding” every once in a while. Note that this was annoying, but not a problem. I assume it’s got to do with me using memory heavy apps.
Any ideas what to try now?
Thanks!
Andreas