EDIT: This has been stated to be fixed in a patch 1.0.66578 (see General Discussion). 
Description: on consoles and during offline gameplay a black loading screen suddenly appears, blocking visibility. The game still runs in the background and apparently can be played but only by ear.
This issue has seemingly appeared with the queue lines and has been reported and discussed in the console discussion here and here 
. More recently multiple events fitting the description have also been reported here and here.
This is dead serious 
.
As you might know most people who regularly play offline tend to play hardcore characters (no deaths caused by lag etc) and particularly in higher difficulties not seeing what’s happening in the game for even a couple of seconds can mean permanent loss of the character 
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In the latter discussion you will find that players are speculating the cause to be the queue, supposedly even when entering an offline session the queue runs in the background and when it reaches 0 the “black loading screen of death” appears.
Kindly investigate.