pc shuts down when playing rainbow six

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Dec 6, 2015
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So, when i only play rainbow six..My pc shuts down for some reason. (in short)

First, i had this pc for about a year (even less i think) and i played rainbow six siege on this pc before fine..but some month passed and i went back to play rainbow six and this is when my pc started shutting down when i play rainbow six. Once my pc shuts down i would have to turn it back on. I don't think its temps because again i played rainbow six on the same rig for about 3 monthes straight without any change (i've played other intense games like pubg,rust, etc...)But during this problem i did add new ram and a cpu cooler (thinking it was my cpu temps but didn't help). I messaged ubisoft and they said it was my nvidia driver so i did a fresh install by using DDU and installing geforce experience. But still..my pc shuts down..I've verify the files and uninstalled the game and installed it again. But that didn't help unless i have to do that after i reinstalled my driver.

P.s i have never overclocked my pc ever..i do have dual monitors but the problem did happen before dual monitors if that is important (i believe it was before dual monitors)
People have been saying it was my psu but again i can play other intense games...And also there was this one time my pc didn't shut down when i was playing rainbow six but that was one day. I don't know what i did or if something happened but just happened.

Pc spec:
cpu: amd fx-8350
Motherboard: sabertooth 990fx r2.0
psu: 500watt evga 80+
Ram: 8 gb -->upgraded 2 x 16gb

P.S: My pc just shutdown playing GTA V and my pc "by touching the case" it was hot as when i play rainbow six.
 

leaveleague

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Dec 6, 2015
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For some reason when i reapplied a new paste of thermal..It worked fine..After 3 month..And my computer just gets shut down it doesnt reboot