Stupid client

My client keeps on bugging out, and on 1/2 my games, right after I get into a game, my league client says it wont open, and it says "we have restored league to an older patch, wait a while for us to restore it", and then after that it won't let me log in. Then, I get a ban on my game that I afk'd for because I cannot log into the game. Come on man.... I play on a mac btw