Random bits of black screen in game

I have been experiencing this problem to no end. I have gone forum after forum but cannot find the answer. During the game, not champ select, I will get 1 to 2 second black screens but still retain game sounds. They are very random, sometimes back to back, sometimes 5 minutes in between but it always happens over and over. Brand new build, all drivers are up to date, DirectX is up to date. I have tried the DPI fix but it only made it worse. It seems this is a common problem without common fixes but if anyone knows the way please let me know.
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