Mac client shutting down

My client is shutting down 24/7. Whenever i'm in queue not in queue it just shuts down. When i'm in champion select it stops doing this, so i have to get in champ select as fast as possible. (it shuts down in queue too) During the after game discussion it always shuts down. (always) Since i updated my mac version to El capitan 10.11.1 it started doing this. Anyone has the same problem?