Okay, I finally figured out what superfreezes my PC. It's Cura. And it's version 4.4
It was pretty hard to find out what caused it. First it felt totally random. Then I noticed I could game like 8h straight without a single crash.
Wasn't able to find out any crashlogs or events, other than "power failure", which was caused by me flipping the death switch behind my pc.
Finally, only thing I had on was Chrome and Cura. Googled this problem and here I am.
PC specs:
2700x
GTX 1080
16Gb ram at 3200Mhz
2x SSD, 1x m.2 ssd and 1x HDD