If you go to the Capture the Flag arena, there is a way to get outside the map. Players use this glitch to make the game lag and to take the flags outside the map. People also use this to raise their kill count by killing players before they even join. Please patch this, it is very annoying.
To do the glitch:
1) go to a base (blue or red)
2) stand in the exact area where the gate closes
3) have someone in the opposite team stand next to the switch to close the gates
4) have that person use 'fatal burst' on your character and click the switch during the attack
5) you are now outside the arena