Draft mode making client crash!

It doesnt happen all the time, but it generally happens in draft. When everyone readies to go to the lobby a lot of the text boxes, splashes and other graphics are missing. Some of them i can get to appear after by hovering over them. As soon as the banning phase is complete the client freezes then crashes. I wind up with a dodge penalty for some reason. This is EXTREMELY irritating. Plz fix riot.