Programs close for no reason

Hey everyone, for a few months now I have problems with Fortnite and other games crashing for no apparent reason. Mostly noticable if the PC is under any stress. For example if I play normal Battle Royale and jump out oft the bus, the game crashes instantly. But if I play on a small creative 1v1 map, it doesn't crash for atleast 10+minutes. But also if I limit the FPS to 30, so I play with the "bare minimum", then I can also play Battle Royale "normally". If I set it to 60 FPS, it crashes shortly after something even close demanding happens. The weird thing is, that the crashing is just a