Client plays Matching BGM during game

So this has happened to me Quiet a few times as well as to a few friends of mine. I'm not actually sure what exactly brings the bug about, But you know the BGM when the client is searching for a champ select lobby? that oddly ambient music happens to find its way into my game, and it plays untill i am out of the game and the client resets for the aftermath scoreboard. And no matter what i do i can't get it to stop and its obnoxiously annoying.