After over 300h, I had my first crash yesterday. Huge map, Emperor, 5 AI plus me.
Happen the same turn, over and over again. What ever I did in that turn, didn't change the outcome.
What solved it for me, was going back on a save (8 turns), and had some other outcome in my ingame choices (another bonus from a goody-hut, etc) and then I was passed the "bad" turn.
This tells me that there is some ingame events that must be just "just right" (or wrong), so the game freezes, just after AI turns (or at the last AI event?) At that time, I hadn't met any other AI's (killed one, to close to me)