While playing the game the pc suddenly restart

The pc suddenly restart while playing the game. Thi bug is very randomic and sometimes happen after hours of gaming some other times afrter a few minutes. The bug happen only if you are playing in world, there's no difference between single and multiplayer. I alredy check if it could be an overheating problem but the pc doesent restart also if playing other game or doing very heavy task for hour.  I can not attach any file because after rebooting all data of any crush are lost.

Thank you very much.