Issue with my 1080ti

Feb 24, 2018
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I’ve been experiencing this issue with my 1080ti that while I’m in a game of rainbow six siege it will completely freeze and these thick pixel like squares appear. It only happens when I play that game. I’ve tried playing other games for hours and hours and it just doesn’t happen. Please help

Pc specs.

i7 8700k
1080ti
16 gb ddr4
850w psu