Weird lags at minute 5-10 in every game

Hello everyone, since I started playing League again like a month ago I have this weird lag in every game for about a minute when I'm 5-10 minutes into the game. It delays my input by about 3 seconds, sometimes I can't move my cursor properly and sometimes the game just straight up freezes. My ping stays the same, only my framerate drops. Although other than that the game runs completely fine on high settings, I tried palying on low settings hoping it would change anything. As you can probably guess, it didn't. So my question is of course if there is any way to fix this. Also, what is happening ingame during that exact time that may cause these kinds of lags?
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