I was getting messages from PC gamers and most of them have the same question that why their PC is restarting while playing games and the answer for this question is there is not a single reason for this problem, that's why I am writing some reasons which might be causing this issue:-
- Check your PC malware report
- Overheating can cause this issue
- Check your GPU temperatures
- You can do a System restore
Article:- https://getassist.net/computer-restarts-when-playing-games/