PC restarts when playing games like fallout 4 and witcher 3

Narwalrus117

Reputable
Dec 5, 2015
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4,510
So basically it all started roughly a week ago when I was on fallout 4, roughly 5 minutes in my computer just restarted on its own and I don't know why. I wasn't able to do much over the week with it but did manage to test out fallout 4 on Thursday and it worked fine then last night I got on for 5-10 hours and it suddenly restarted again and restarted any time I got into the game for 5 minutes or so every time I tried to get on afterward so I turned it off and went to sleep. This morning I decided to try out another graphically demanding game (games like tf2 terraria and starbound all work fine), I chose witcher 3 wild hunt. It then proceeded to do the same thing over and over again when I tried to play it. My PC specifications are
Geforce Gtx 970
AMDFX(tm)-8320 Eight Core Processor
8 gigabyte ram (with 7.95 available)
1920x1080 60hz
driver version is 359.00
Microsoft windows 10 home
The main reason I am asking is because the temperature is changing, I have a fair amount of dust around (though I have already dust busted my computer without removing any components) and I have never had this problem before. I'm getting kind of desperate here so any help that you guys could give me would be much appreciated.