My vision 2 camera started delaying the video feedback by several seconds and now doesn't show the feedback at all even though I can still take photos and videos.  I just cant see what I have taken for photos until I remove the card upon landing.  Any thoughts?

Hello Bob,
Let me confirm that after you opening the dji app, you get a black screen but you can still control the gimbal and take photos, right?
It seems that there is something wrong with the wifi module.
Please try to bind the range extender&phantom again.
Is it possible to try a different mobile device?