I have a samsung galaxy s6 (SM-G920F) running marshmallow 6.0.1 that has been rebooting frequently even when in safe mode. If the device is plugged into a USB cable it seems to freeze when trying to boot after the crash
Have tried a cache partition wipe and clearing all app cache (although downloaded apps won't be launched in safemode anyway)
Is there any way to debug what's causing the phone to crash/reboot?