I was just wondering if any one else was having the same problem, i looked through the forums and from what i could see no one else was having it. It's happened three times so far, I will be approaching Camp McCarran from the south it will add the marker on my map, but as I keep going a little north of the guard ( if your facing the entrance to Camp McCarran its on the left hand side) i will walk towards the entrance and the game will just shut off and take me back to my PlayStation menu (where you can log on, watch movies, look at photos etc).

The odd thing is I can walk around it but if I come at it facing away from the entrance it does the same thing. I have had the normal freezes I would expect, since played F3..

Any Ideas ?

Yes it happened to me too you're not alone. The only difference is I was at the Hoover Dam when it occurred. It goes to a black screen and to the XMB , but to clarify it happened while I was swimming around. Near the left side of the Dam there's a broken fence and a bunch of rocks. I jumped off right there and went to the bottom to the shore and the screen went black as I was swimming next to the dam.