After the recent release of Halo Reach on Halo MCC the update has resulted in a narrator being stuck on. I have scoured the settings in both the game and the Xbox but can’t stop it. I have tried uninstalling and reinstalling and hard restarts. This problem has completely ruined the hype of Reach’s release. 
Please see the pinned thread regarding Halo Support and how to submit tickets for issues you may be experiencing.