Apologies if this problem has already been addressed, but help would be hugely appreciated!

The game freezes every time I go to (fast-travel or walk) certain locations, (namely: quarry junction, black mountain and a large area east of poseidon gas station). I've been to each of these places once before without trouble, but am completely unable to reach them again. Fast-travelling results in an endless loading screen. Walking there the game crashes in exactly the same spot each time.

Despite the bugs I still love this game, but these are three areas in particular I would really like to check out. Can you help me forum?