Halo 4 banning system a little whack?

Alright, so I was in the community map playlist (Swat on Scythe) and I finished the game with a score of 480 (35 kills, 1 assist, 15 deaths). The highest on the other team was 165 (10 kills, 0 assists, 13 deaths), and I assure you this was a legitimate game. After the game ended, I was booted to the “Infinity” section of the menu, where you can go into War Games, Spartan Ops, Forge, and Theater. I thought it may have just been the host leaving and causing a glitch, but that was not the case. I didn’t get an in game message, so I thought whatever. When I tried to go back into War Games, I got this:

Player has been banned from playing matchmaking on Xbox LIVE. You cannot start matchmaking with banned players in the lobby.

No,I don’t have a mic.
No, I haven’t quit out of any games within the last 48 hours
No, I did not manipulate the system to benefit me or detriment another player.

I just want to know why I got banned. I couldn’t have been reported for that game because it was instant and it was the first game I had played other than forge all day.

If it matters, I can list the medals I got.

Medals

Headshot x32
Double Kill x9
Kill x3
Killing Spree x4
Triple Kill x4
Overkill x1
Comeback Kill x2
Avenger x2
Distraction x1
Assist x1
Revenge x1

All and any info regarding my ban and how long it may last would be very much appreciated.

Item Obtained

says you quit 3 games in a row 2 on Ragnarok and 1 one Complex. so that is why. you can view anyone’s games on waypoint. sry bro.