I have a Windows phone 7 powered LG Optimus 7 which randomly reboots, and this occurs especially when it is plugged into the wall charger and receives a sms. The phone then reboots, and there is no new message on the phone - the sms just sent to me is lost after the reboot. Anyone knows what is going on here? Thanks in advance!
If your device is rebooting in [a] loop [...] and it happens even after you reset your device to factory defaults, I would say [that] is a valid reason to claim warranty repair/replace[ment].
Source: Martin V., WP7 Support