I'm in Venice and when I tried to go into the Assassin's Tomb, it froze right in the middle of loading (where Ezio is in the white "room"). The camera wasn't moving, and even the little "P" thing on the controller didn't work when I tried to press it. I tried rebooting the PS3, but after logging in as me, after a little while the screen freezes again. I really don't want to start over because I've come so far. Help?