I bought Rock Band 2 about 5 days ago and the guitar just stopped working. Well,, it works somewhat. The only buttons that register are the red buttons (both fret and solo reds), the START button, and the little circle xbox button. If the guitar is on, I can’t navigate through the menus to select songs, nor can I select anything. I can’t even turn the controller off. Is there a setting to lock/unlock the guitar or something? Or is it broken and I just have to have a warranty replacement.