I'm just moving this here so people can explain why it happens/how to prevent it. We cannot do anything about the TC as per: "4. If a player disconnects during a duel, it is counted as a loss for the disconnecting player, unless they both agree to have a rematch. In the event of a player who either intentionally or accidentally cannot complete the match, they will be considered in violation of the duelling agreement, and forfeit the duel as a whole."
Sorry about that.