Traits and ancillaries possibly, back up files and delete the entire trigger sections of both files.
Have you got any settlements that are likely to revolt before crash?
Have you got script?
EDIT: oh and making some changes to data files and then trying to play on old map.rwm can give 'random' crash problem. Might be worth deleting that and trying again.
More questions does it fall over if you run it on -ai? Or just if you are physically playing as them?
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