Crash report,game update after already being updated.

So I was just playing URF and my game crashed, and than it asked for update (Currently while writing this) when I came back to the game after 15 min that it took me to come back and reconnect, it gave me the message of Leave Buster or something like that, and is annoying because I didn't Intentionally AFK which made our team, they guys in the game understand about the case, so nobody report me, but still something that is annoying because is not the first time that happens, is it there something that is causing it, or is something about the server? I have few friends that they had the same problem, and I don't want to be affected for a game problem.