Every game screen goes grey then comes back

Every game, normally as a teamfight starts, my screen will go grey then come back after a few seconds as if it had just changed inputs. It sometimes affects my audio as sometimes I use speaker connected to monitor and other I use headset. I thought this would be my GPU drivers but after a fresh install using DDU it still happens. I have also tried repairing and reinstalling lol completely. I don't get this problem with any other games and I normally play Destiny 2 and Apex Legends so it's not a matter of performance. I've seen only 1 other person bring up [this issue](https://boards.na.leagueoflegends.com/en/c/bug-report/kFy3y9GR-grey-screen) and they got no fix.
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