I need help. I don't understand!

I been playing halo since the beginning, and I was never banned, FOR ANYTHING! I’m one of the few clean players out there. I don’t cheat,mod,hack or tamper in anyway. So yesterday I was playing reach like any other day, I shut the xbox off for 2 hours. I turned it on and it says I was banned for 1 week from matchmaking! Why is this? Yes I read all the forums on this topic,but all the replies don’t match up with anything I have done. I don’t sell gamer tags, I don’t do any thing, I just play halo. So can some one please help me out?

You’ve already got your post here, reposting it is against the rules as it is considered a duplicate topic.

Please follow up in that thread. Thanks.