I've been banned for no reason?

So I was playing some Halo 4 online with my friends today and we had just finished a match, and we decided to change game types. When I went to play another game mode a message popped up at the bottom of the screen informing me I was banned. I’m not sure if this is temporary, but I have done nothing that I have seen to receive this ban. The only possibility would be leaving a few games, but I don’t believe I left enough to get banned from playing (and I had not left any games for a while). I hope this can be fixed, or at the least I can find out what I have done wrong so it will not happen again.
Thanks

It might be a quit ban. That’s all i can say.

Do you know if they are delayed? A certain amount of time or is it “instant”?

I’m showing that you didn’t finish 6 of your last 15 games. It’s probably a quit ban.

Halo 4 Ban FAQ, listed at the top of this forum.