Seems if someone disconnects, it can still disconnect other players. My guess, DalzK, is that someone left and their leave killed your connection. Thus, counting it as a DC for you and all the players in your game turned to AI, thus ending the game.
There was one disconect, which forced half the people to leave. That left me and one opponent which I was beating. He then quit, I was given the victory screen, and the game ended.
How can stat tracking still be so poor?