Leave Buster Problem

I've been having trouble lately where I have to close league and reopen it to rejoin the game I clearly rejoin the game and finish the game to completion yet I seem to be punish for dcing from the game and having to close it just to rejoin the game as of lately I've been having to wait 20 minutes just to play a game thanks to leave buster. can someone please fix this as it has made playing games with friend difficult as of late as well as ranked battles and ranked team battles.