This is only an xbox problem.

As far as playing Offline mode, we've confirmed that if you are having the 4-bar logo hang, you can still put xbox in Offline Mode and it will let you start the game. There's no reason to play your career/solo in Offline Mode all the time. It will cause sync delays on those times when you do try to play online, and may not save properly anyway. I'm only suggesting Offline Mode as a troubleshooting method.