Just putting this up there as I've been having a similar issue. After making a save nearby (but not in crash range) of the front entrance to the Reach, I switched into Tactical camera mode and had my character move to the front of the stairs while remaining in tac cam. Once I reached the base of the stairs I switched to normal camera mode to no ill-effect. Working my way through the building right now, and not running into any issues. Hope this helps!
