The AI died (stopped building rooms)
Windows 10 64 bit, 8 Gm RAM, Intel(R) Core(TM) I7-4500 CPU1.80 GHz 2.40GHz GPU: AMD Radeon R7 M265, Intel(R) HD Graphics Family. v2.0.8f6
I just played for a long time and the bottom left AI (Lamash) died. I even built him (via god mode) rooms - he immediately sold them.