Yeah this happens to me a lot. I have to constantly eject and insert the disc. It eventually works, but it is annoying. If you ever find that it doesn't work, you may want to call Xbox support.
https://www.trueachievements.com/gamercards/SliferCynDelta.png%5B/IMG%5D">https://www.trueachievements.com/gamer/SliferCynDelta"><img src="https://www.trueachievements.com/gamercards/SliferCynDelta.png











