Madden 12 Game Freeze fix.
If the Madden is freezing at the start of the game when online:
1. Clear system cache
2. Delete profile only
3. Delete Madden online pass, Madden game saves, and any corrupted game data.
4. Delete last system update. (Call Xbox support on how to do this.)
5. Reboot Xbox
6. Install the xbox update.
7. Download profile
8..Download Madden online pass
9. Restart the game.