Why can't I play on Matchmaking in Halo 3?

[Hill]

In Social Slayer, I just wait for enough people and once i'm on the lobby screen before the game starts and when im about to vote, it just takes me back to the lobby. I don't press anything and its done this several times. It was working fine 2 hours ago though.
nope, it didn't work

 

[Tyler]

try turning every thing off , unplug you internet connection and wait a minute then put it all back ..edit the question and tell me if it worked