FPS drops and MS spikes

I am just wondering if anyone else is experiencing what i am. I literally have no lag, no fps drops whatsoever 99% of the time. Then suddenly i have huge issues. It usually happens right after a patch, but sometimes it occurs randomly where league starts to take like 70% of my cpu usage. The only thing that helps it is uninstalling the game and reinstalling. It then goes back to normal for another week or two until the next patch or until another one of the random occurrences and then i need to restart the entire process. This is also a very new thing however. It didn't start until about a month or so ago. Any help would be greatly appreciated.
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