My game goes slow motion at times.

So my game randomly during games go slow motion for no reason. Doesn't matter what settings I have, my drivers are up to date and nothing has changed in my PC for 3 years. My game slows down and then jump forward to were minions and champs are supposed to be. It's not some random lag-spike or something like that. It started randomly after the championship skins came and it won't go away.
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