Then there were three large islands, one of which the remaining AI started at.
That one was quickly slaughtered by barbarians, but on the main continent, there was only moderate barb activity.
Later on I discovered why, the island continents were FLOODED with barbarians...
I've had the same thing happen as you can probably tell by my earlier rant.
Are you playing on fractured world too? Because if you are I think it may be the map type screwing up the barb spawns, and subsequently causing increased MAF's/crashes. It would account for most people not getting this problem...