Anyone else having client issues?

Twice in the past week on two different computers I've tried to get into a game but the client poops itself after I leave champion select and won't let me in no matter what I do. I tried exiting out and going back in, using task manager, waiting for a bit, etc. and nothing has worked. The client only goes back to normal after the game ends. I'm afraid I'm going to get banned if this continues. Anyone else having this problem?