Their system for banning is a little to harsh. I've been playing Halo since the first game and never had an issue with being banned. But I was just playing a game of SWAT and out of no where I got banned for no reason. Don't know why or how, the game was extremely laggy and it was not going well for anyone and I randomly got a black screen and was banned from playing area. Don't know how long or even what for on that matter.
They need to lighten up the ban system a little and give us a time for how long if someone does get banned.