There is a big big relay bug exploitation, My team have see the bug exploitation on a server, you can win so much score than the score go to negative number.
In fact on guy on each team need to take flag and let him down, and the other guy wait for take the flag... Sorry for my bad english but you got the idea.
Please do not ban the guys who did this (I have try to see if it is real), just lower their level.
HURRY UP !