Question My computer crashes after exiting games, but still running in the background

Mar 21, 2019
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Hi, I got my pc in 2016, worked great so far and I've never had any real issues with it, until recently, while playing the usual games that I'm normally playing, all of the sudden my screen will go off, and I'll hear the sound of windows 10 shutting down.
even though its seems like a crash, the pc is still working, and let's say I play music from youtube while this happens, the music will keep on going in the background like nothing happend.
Now it's mainly happening after playing for more than 10~15 minutes, and even after exiting the game to desktop.
I already tried cleaning it from dust, and updated my gpu drivers.
That's my specs:
Intel core i7- 6700K 3.4ghz
Gainward Geforce GTX970
Antec VP600P 600W power supply
MSI Z170A GAMING M5 motherboard
HyperX 2x8GB RAM
At this points I really don't know what to do, i'm not an expert and i'll appreciate all the help! :sweatsmile::sweatsmile: