Hello jappy,

When my xbox 360 starts to run sluggish (slow loading, sound lagging etc) I clear the cache in the dashboard and it has solved my issues. I have never played rock band so I am not sure if it will solve that issue with that game. Here is a link on how to clear the cache on your xbox 360.

http://vgstrategies.about.com/od/xbox360faqs/a/ClearX360Cache.htm

Good luck! \:\)

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne