Critical Error during game

During games my screen freezes and I can't do anything except CTRL+ALT+DELETE to see this error. i can't close the window,I cant press "Yes" pr anything,I can't ALT+F4. I can only restart my PC and play something else until that game ends (if I reconnect it happens again during loading) I already got "Leabuster" 2 times this week cause of it ( 20 minutes for 5 games...) i saw a lot of other people have the same issue,so Riot needs to do something about it. Until the issue is fixed I can't play League of Legends. btw:I don't think I need to take a screenshot cause everyone knows how a critical error looks like.
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