During the mission im on where the sanctuary is under attack from the empire and u have to go in the nightmothers casket with nazir, my xbox will freeze once the nightmother talks to u.. any idea on what to do?

I had the same problem, what you have to do it wait. It's the only action you can do, i waited a day then it continued. Let me know if it worked.

Edit: I should say your ment to wait inside the coffin when she says "Sleep".

This happens to me, too. I'm pretty sure it's a glitch. Hopefully, it is patched soon.