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So here's my issue. The League client will work perfectly fine for the most part. However whenever I open up the Task manager it'll show that the program isn't responding. Why? No idea. But I can't tab back into the program and have to forcefully switch to it. Then on occasion it'll go completely nuts and close for absolutely no reason, whether I'm in the Store, surfing my profile menus, or even in the character select screen and even when I'm in the middle of a game. It'll just derp right the hell out and shut down. For no reason at all. I've repaired my file cache, re-installed God knows how many times. And I haven't been able to get rid of this really annoying bug.
I should probably note that I'm on a Windows 8 64-bit operating system with a rig powerful enough to run three copies of Crysis at once, so graphics and processing issues are out of the question.