Critical Error - constant

Captured with Lightshot
So I've had this problem on and off for about a week now. its not every game, but the games it happens in I cannot load the 2nd page after Champion select. I have tried to repair, Run as admin, and look around to see what else I could do, I ended up having to re-Download the game to try and sort this problem out. does anyone have an idea of whats causing this?
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