Have you diagnosed the jumper pak / expansion pak?
Expansion paks are known for resetting the system randomly (ESPECIALLY 3rd party ones)! due to overheating. Try using the original jumper pak (not expansion pak)? When it overheats, the systems goes black, then it cools and the system reboots..
The console gives a “black screen of death” if the jumper pak isn’t seated perfectly. If it’s loose or corroded at all, the system will just go black, with the red light still on..