I have to say that the stability suffered a bit with the DLC.
It's not
crashing constantly, but every 2-3 hours the game freezes and I can only 'Alt-F4' out of it.
I encountered a handful - if that - of crashes to desktop in EA, but in over 1400 hours there weren't any freezes I can remember with the vanilla game.
Edit:
This is the exact moment of the freeze: the graphic below (the turn order, or whatever you call it) comes in. Maybe it has something to do with using the new 'End Round' button?
Maybe it's only my system, but this happened multiple times now at the end of the fight. Possibly an overlap of the 'The Enemy Retreats' Graphic on screen and the 'Do you really want to end the round' graphic?