Same thing happens to me also, even after August 19th update which I was hoping would fix this problem.

When talking to Xavinian regarding the different Delve equipment, it only takes a switch to looking at a different piece of gear to cause my XBOX to freeze up. Then I have to do a hard reboot using console button. Tested this a few times to make sure it wasn't a one off, but he consistently locks me up.

I am thinking it might be XBOX users only.