everytime I log-in

every time I have logged in for the past week now I had to deal with the fact I cant play a game at all. I can log-in and see only ranked, blind, and draft. The game will black screen and then do nothing on blind pick but draft pick I can start a queue and then accept the queue but it then will black screen when I do. I have had to uninstall my game everyday now and its starting to get really annoying. Is there a way to fix this please.