Riot pls fix this bug - Cant Reconnect

So i was playing game for promotion (1w,1l) and when it started it instantly crashed my game. I tryed to reconnect but it was always bug,it was saying that i have no internet connection but i did have! When i joined game in 16 min we were losing badly but i made comeback. We lost game and i got BAN + This is happening to me very often Pls fix this bug