I was in the middle of a League of Legends game and then the screen just went black, and at the same time I could see a red light on my motherboard which later turned white. After the screen was black for a while, the pc just booted up like it normally would.

The first thing I thought of that might have caused this issue is that the thermal paste probably have hardened, since I haven't been at home for a couple of weeks. I noticed that the temps were quite high (80 C), so if that's the case then the cooling capability would be severely hindered which would probably trigger a safety protocol to reboot the system. Would I need to re-apply thermal paste or could it work after some use, so the thermal paste softens?

I also checked the logs in Event Viewer and the latest logs looks to be error messages, but I really can't make out what the exact issue is. It says something about that the server didn't register with DCOM? Really not familiar with this sort of stuff.

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Specs:

Windows 11 x64

ASUS ROG STRIX B450-F GAMING

RTX 3070

AMD Ryzen 7 5800x3D

16GB DDR4