Computer restarts randomly

Oct 10, 2018
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Hello everybody, I am having an issue those last days. When I play cs:go or an other game for like 30 min or something like that, my pc restarts. So I've looked up on the internet for the solution of my problem but I can't find anything. But what I do not understand, is that my pc is like 50 degree and same for my gpu. I hope that somebody can help me with this problem because I'm getting quite frustrated :/. Some people are gonna tell me that I need to clean my cpu cooler but I have built this pc for like a month, so I don't think that this is the issue. (Sorry for my bad English btw)

My Specs:
CPU: I5-8600k (no oc)
GPU: GTX 1060 3GB (no oc)
PSU: be quiet! System Power B9 600W
CPU-cooler: XILENCE CPU cooler
Motherboard: Asus PRIME B360M-A