Sadly I have no idea what triggers the crash so far, but I can tell you the location when it did trigger.

1) Kemm's Mansion (Right before closing Old but Gold quest)
2) Arx Town Square (After doing some shopping and inventory management)
3) Lizard's Consulate (After 2nd cursed remnant encounter)

For now I am avoiding autosaves altogether since that is the only common factor I am able to identify...

I will try updating you if I stumble anything more useful.