FM4 has crashed a couple of times for me now. I will be in the middle of a race or in the auction house and suddenly it crashes to the dashboard. I also noticed that at the dashboard, it does not recognize the disc, but if I hit A, it does start it. Another strange thing is with the FM4 disc in, on the dashboard, it does not list any of my games in the game library, but if I insert a different game, all is fine. It also said that I have 60000 credits for importing my FM3 profile but I could not see them in the game.
Couple of things to note here. I downloaded the bonus track and cars in the dashboard before I even played the game. I also imported my FM3 profile. It is possible that I have received a defective disc.