I can't tell you why, but for me DoD ( + RotDG and CotW) just crashes whenever it feels like it. At first I thought it was related to interacting with traps and locked doors but actually i just need to hammer space for a bit and one turn in 40 is sure to crash the game for me at any given time. EDIT: Might be valuable to add that it got progressively worse per floor and at this point it has become nearly unplayable. Save game included.
When I load your save it says "the dungeon has changed" and then crashes, strange. We'll look into it.