People who just, If they dont Bribe King Kromo, Boom, out and they join another game, Just farming Bombhead masks.
There should be a Block System that, Each time that You leave a Lockdown game, You wont be able to join a Lockdown game for 5 minutes or 6.
Something Like League of Legends Summoners code, Cant leave a game.

Just think about it and consider it.