I know the pain of all of you. I have a 2010 Fusion SE and I use a 4th Gen iPod Nano. About every 3 or 4 weeks I get the "Index full..." message and the system freezes up. Or I get the "No USB device connected," etc. I have had my car into the dealership several times for same problem. The only thing that corrects it is a "hard reset" ... in English, that means disconnecting the battery. I eventually filed for Lemon Law. Ford's local "field engineer" came to the dealership to look at it, and said, of course, that everything was working fine. When I picked my car up that evening it was still malfunctioning. I showed this to the service manager and he basically didn't care. Corporate Ford has since sent me a letter politely telling me to bug off in nice legal language. They simply do not care.