Black ops Zombies question?

I play on zombies online on Black ops and then we were at round 14 doing so awesome and I was having fun and got a Ray Gun and pack a punched it and bought the juggernog not to mention the quick revive thing and used it to revive my allies quicker when they got downed. (nobody got downed many times at all it was just getting too tough to survive) not to mention I got downed 0 times not 1 time! Then out of nowhere while I was having a ton of fun with those guys, host ended the damn game! I get really tired of that happening and want to know how to become the host and how to know who is the host because it happened to me too many times.... the host ending the game. Btw I got great internet connection.