Stop allowing people to sabotage other's games by joining games and then immediately leaving! And auto re-create games if this happens.
Also if pair of players play multiple games in a row and they end up too fast (clearly something wrong happened, game was not played properly), block pairing between them.
Also if pair of players play multiple games in a row and they end up too fast (clearly something wrong happened, game was not played properly), block pairing between them.