League crashes in the loading screen forcing a hard reboot

I have had that problem multiple times in the past weeks / months now. While I'm in the loading screen and Alt-tabbing the whole monitor freezes in the loading screen and makes it unresponsive/unuseable. I can use Ctrl+Alt+Del and get into the Windows menu to open the task manager but it won't open and the loading screen will ALWAYS be on top of every other application being unresponsive. While all of that I can still use and do stuff on my second monitor. My PC is not low end so that definitely should not be a problem. I have read about similar issues but not that people have a monitor working perfectly fine while the other just had the loading screen blocking the whole monitor. I would appreciate any help, I have tried for a repair which didn't help either
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