This started to happen a while ago. I used to ignore it for some time, but it constantly bugs me.
When turning on the phone, it will ask me for my SIM pin. If the pin is not entered within 8-60 seconds, the phone reboots.
If I enter the SIM-PIN but don't enter the System-PIN afterwards, everything is fine. The phone stays on the lockscreen.
Sometimes it reboots normaly, booting and asking for the SIM-Pin again afterwards, but more often it reboots to recovery showing the screen where I could retry boot or reset the device to factory settings.
This causes problems for me with auto-reboot which doesn't bring up the device, because it ends up in the recovery screen.
Another problem is, that the time I have for entering the PIN is sometimes very short. I don't mange to do it before the device reboots.
Something must be screwed up. Unsure if it's some setting I changed and forgot? Does somebody else have this problem? Thank you very much.