What is with this constant freezing issue at the Hoover Dam? I try to leave the Office where Colonel Moore is and it starts to load then a black screen pops up and my Xbox 360 Slim freezes, had to restart my Xbox 5 or so times today, no joke, this game is nearly unplayable and it's been out a year or two now... I don't understand why the game is so glitchy. Is there any way to fix this issue???

I've had a few issues around and in Hoover Dam also.

I've fixed it by: - Instead of hitting continue when the game loads go to "Load" and manually select the save point you want.
I don't know how it fixes it but it must loads something differently and allowed me to leave the Dam.