I've only explored roughly half the map (diagonally top left to bottom right is all done), and last night I had a base recaptured for the first time. It was the one in bottom right between where the contaminated and irradiated areas start.
It was cool that that can happen, but I couldn't see why it was happening.
I didn't see any enemy bots in the area, it just seemed that I'd turn my back and it would spawn some in a previously empty field. Is that the case? Were they perhaps walking a long distance from somewhere else? I had cleared the cul-de-sac near it, and everything up to the irradiated and contaminated areas. Were they walking all the way from there?
It just seemed that I would clear it, then another faction would take it when my back was turned. Then I'd clear it, then it'd get taken again. I think I captured it 4 or 5 times. Then suddenly it stopped happening.
Is there some way to relay to the player that a base is potentially threatened? Or enemies are approaching? Because other than in this instance they don't seem to roam far until a player triggers them. Up until that point a captured base has stayed captured.