Hey,
so I went for the Underdark path, cleared most of it, then decided to check the Mountain Pass.
Finished all of the Mountain Pass and went to check for an old quest in the Underdark... Boom, game crashes on fast traveling, went back multiple saves, same story. Once in a while, with no clear reason, the fast travel works BUT the game prevents you from saving (error 701), making it completely pointless.

Apparently, going in to the Mountain Pass map can screw your save, I tried an even older save BEFORE entering the zone and the fast travel works flawlessly. BUT the error 701 comes in again, preventing from saving, moving again to the Mountain Pass map results in an infinite loading screen stuck at 0%.

I am stuck whatever I do, should I skip the zone entirely? I am not going to restart a playthrough after 40 hours because of a bug.

Any solution or fix?