I recently built a new PC for a friend of mine, and everything seemed to work just fine. The components are a Ryzen 7 2700X, RTX 2070 Super Windforce OC, Corsair TX650M, and a Gigabyte B450 Aorus Elite Mainboard. I did a basic GPU overclock (+110MHz core clock, and +800MHz memory clock). Kombuster ran smoth for about 20 mins so i thought everything is fine. When my friend tried to install a game, it just kept crashing without a reason. It's the same with every game we tried so far. If you leave the system off for a longer time, you can play games for about 20 minutes until it crashes again. The temperatures are fine (max 75°C GPU and 66°C CPU). Do you have any ideas what could be causing problems here?