I have a Lumia 920 with WP8.1, it is randomly rebooting, It will reboot more often when plugged into a charger.I've searched for clues on this, but haven't seen much with WP 8.1 Any help would be appreciated.
It could be multiple reasons. I would say if you have the time and patience, reflash the phone again using NSRT. If not then try a hard reset and do not restore from backup