Very annoying bug with League Launcher

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Hello,i've been having this problem for a while now. Please help me i dont know how to fix it. I've tried everything,reinstalling,hextech tool,putting the game on another drive from C to E... First i got the issue fixed it was saying repairing but then after 10-20 games on URF,i tried the next day and i had the bug again. Whenever i have to exit out of this i have to use the Task Manager. Please help me,i need to fix this permanetly. Thanks.
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