Originally Posted by
CountMRVHS
Sometimes crashes occur on the AI turn as the result of a rebellion in an AI settlement (IIRC). 376 is only around 40 turns in, though, so it seems a bit too early for that sort of thing to start happening. (I remember people running into an issue like that ~400 or so, but not always.)
I'll try to get some time to look at your save. In the meantime, I wonder if you could turn off Fog of War and cruise around the Harad & Rhun parts of the map to see what's happening - settlements with low public order, or sieges about to conclude, that sort of thing.