Avast Anti virus crashes game

Ever since the update this morning ive played for 2hours then logged off for 3 hours then went back, couldnt get into the game at all(got demoted first time) then was weirded out(and angry) i've went practice tool and got into the game, then i went into another ranked game and couldnt connect, lost 20LP(if riot can do something off of this), went aram and couldnt connect, ive reseted my internet, did full repair and couldnt work, just now ive uninstalled avast anti virus(which the garbage installed itself but i didnt mind shit) and the game worked, so if anyone has troubles with it. uninstall that shit and you're good to go