Game freezing since patch 7.14

Hello there, I have a problem with LoL since patch 7.14. Game is freezing/lagging for no reasons. It takes about 30 sec to 1 minute to unfreeze and happens randomly. I set the graphic settings to low and it still is happening. It's not the connection issue as I don't have any lags in other online games. I hoped it would change in patch 7.15 but the issue is still there so I decided to ask you guys. Anyone got clue what might cause the problem?
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