Fallout: New Vegas keeps freezing?

I just completed Boone's second companion quest "I Forgot To Remember To Forget" and I'm trying to get to Ranger Station Bravo now. I'm only a few locations short of the Master of The Mojave trophy for discovering 125 locations. The problem is everytime I head towards Ranger Station Bravo, Devil's Throat, or Camp Guardian my game starts to lag horribly then it freezes. Is this a new bug or something because I got the latest update when I downloaded the Dead Money DLC?