In one of the games a player left and was replaced by a bot. The bot constantly received robber and kept robbing me, even when I was not at the highest score. This kept happening till the point difference between me and other non bot player became 3 points. I was stuck at 3 while others farmed to 6 and bot remained also at 3. Check your algorithm to make sure bots are fair and not ganging up on a single player.