Screen freezes

Since yesterday my screen randomly freezes 1 time per game. When i press ctrl + alt + delete i cant use task manager, it just jumps back to the frozen screen in league. All i can do is shut down my computer by pressing the power button. It happens once in every game i have played which is about 10.... It's really annoying... But once i turn my computer on again and reconnect it doesn't happen until i start next game, then it happens randomly in the game again... Pls help!
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