I am a newbie to RFC, having just started out with the version that ships with BtS. In the two games I started, both times my capital city "is abandoned" after a number of turns. For example, with the Japanese, on turn 97 my capital is always lost, and is converted into a number of samurai, settlers, and other units. No matter what I do (have positive stability, put extra troops in the city, raise happiness), the city is always lost on turn 97. I searched the FAQ and documentation but could not find anything. Is this an intentional, scripted event, or is it a bug in my version of RFC?