FPS drops issue

I have been playing LOL for 3 months now and since the last updates which 5 days ago and the fps drops into 4 or zero which make the screen frozen for 3 ~ 7 seconds on multi-times which is bad and hard to play or to know what is going on in the game! Note: my fps is 147 most of the time! and I was playing fine with no issues during those 3 months! I tried everything and the issue is not fixed yet. is something wrong with Riot or it's my laptop?
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