So I have Red Dead Redemption & Red Dead Redemption: Undead Nightmare on PS3, both digital copies, and I've 100%'d both the regular game and the Undead expansion. I had a break for a few months whilst playing other games, and I've just come back to it and every time I load up Undead Nightmare, it freezes. The regular game works fine online and offline, but no matter how many times I try to play Undead Nightmare, it loads me up at El Presidio (where I last saved), then a few seconds later it says 'Rathskeller Fork has come under attack from the Undead hordes' and then it freezes. Is this happening to anyone else? And why is it happening?