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I'm not a PC tech - but I'd be suspecting overheating on the graphics card.
Then again, I have seen glitches in games. Depends though on whether you have this in multiple games or just one.
Another idea, and I don't know how reasonable this is, is a power glitch. I've an old box - but I hear those new cards use a lot of juice. I'm theorizing that you could max the supply just enough to glitch the card, during peak moments. Can't think of any easy way to check that really, so I suggest looking into cooling options first.
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