Not showing end-game stats screen.

Just what the title says. In allot of my games, I see that after it ends, I won't get taken to the end-game stats screen at all and have to log back into the game client where I'm back at the main menu. This is very annoying as almost every time this happens, there's been at least one player in those games who was acting up, but because it won't take me to the end-game stats screen, I can't report them for acting up.

If this could be looked at and possibly fixed then that would be great. Thank you for your time.

NOTE: It's random when this happens, but for repro steps all I can say is play through a league of legends game (doesn't matter which mode, though it's usually in custom games where it happens at), then watch to see if it takes you to the end-game stats window or not.