Client = black screen in lobby, leaving = 15 minute queue penalty
To summarize, I just tried to play an ARAM and my client bugged upon joining a match, the entire client went black in the pre-game lobby and couldn't do anything other than open my friends list. Determining that it would be dumb to literally go into a game blind, I closed and restarted the client and was greeted with a 15-minute queue penalty for something ENTIRELY OUT OF MY CONTROL.
So yeah, if you could fix this at some point so I don't randomly get punished again for simply trying to play the game, that'd be lovely.