Sometimes can't do anything for no reason

There's no pattern, there are no reasons (at least I think so), but almost every single match I'm having the moments when i can't press anything, type anything or even move. And no, it's not the connection issues (at least I think so), because other players are acting normally (they move, use spells, autoattack, etc). There are no connection spikes at the moments like this, my champion just gets paralyzed.
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