I always hit the xbox button in the middle of the remote and it seems to make it stop. It might just be done loading as well and I just happen to bring up the guide menu right when it loads too. lol try it though it might work mine does it alot.
Mine used to do that as well everytime I loaded up the game. It stopped after one of the previous updates though. Haven't seen it in months. I would hit the guide button on my controller as well like the poster above me stated to stop it.