This is a player-problem. I would try to talk to your players about it and explain how it harms the game and their own position!
Unfortunately too many times people dismiss the game as bad, yet they play it like this...It's like how young kids play soccer when first learning -
little passing and all crowding around the ball. Once they learn it's good to spread out and pass the ball, their skill improves and the game becomes more interesting as well.