Can't ban or select champions in both normal draft pick and ranked games

Everytime i try to play ranked or normal draft pick i SOMETIMEs get to select a champion to ban but NEVER get to choose my champion to play and then i get a msg saying " an error occurred while choosing your champion" then it says i left during champion select and then guess what i get leaver buster, n the worse part is i lose LP over this . The funny thing about this is, my turn will reach to choose and the screen freezes but i can hear the countdown in the background and when it reaches to less than 10 secs to pick then the screen unfreezes but ofc thats a trap because i try and try to pick a champ any champ even the one i choose when it asked to choose my champ but still it doesnt lock in sigh. I reported it, i even reinstalled the game and this still happens. guess i gotta find another game like lol to play that actually is gonna let me play sigh