Default reboots when looking for network

hi i have a htc one on 3 been using arhd since got the phone 6months ago, earlier today it randomly rebooted and has kept doing, it boots no problem but unable to get a network signal, the search for networks is ghosted out, and after a few minutes it reboots and this is repeating, have wiped phone and sdcard completely reinstalled fresh copy of rom but still the same.

has anyone had this problem or know how to solve it pls

now after reflash of firmware and full wipe and install of arhd31.6, i get signal for 2-3mins then lose it, but no reboot, if i restart i dont get any signal also trying to go into flight mode the airplane just flashes