Anything in Windows event viewer, game or display related? Could be a dying GPU. I had or still have that, had to downclock my 1080Ti OC some time ago when I started having similar issues, flicker, game crashes. Started in ACC and I thought it was the game but got worse over time and now happens in pretty much every game unless I downclock
That reminds me of me overclocking my 980SLi's a bit too hard previously Oups.