Hello Friends, I have experiencing this lately with my Phantom 3 Pro and my Phantm 4 also, what I do to ressolve it immediately is disconnecting the USB end from the remote controller and immediately connnect it back, it restores the image and the red banner saying "Weak Connection' or "Aircraft Disconnected" or "No Connection" is changed for a "Safe to Fly" and then I am able to fly, seeing it all in the screen. I hope you all can do this and get signal back
HOWEVER: This is getting me frustrated each time more, We should all send serious messages with these problems, to the DJI Store agents, to the DJI Support page in facebook to the Chats in the DJI website and everywhere we can to, in order to create conscience in DJI that there is a REAL connectivity problem in our drones and if is not fixed we will all return our drones back for money refund, Would it work? I believe that in the measure that everybody do it, DJI would take it seriosuly.......
PD, 2 days ago, I played drums with a band in a rural bar, before the show and between sets, I flew my drone but I experienced this again with my phantom 4 in an area where no cell phones signal, no electricity, neither regular phone lines, but I could not calibrate compass because of a strong interference signal in the place, so I moved far from the building and I was able to calibrate, the possible or sure cause, is that there was a lighting system commanded by a WiFi signal device and I think this was the cause of my interference, HOWEVER, DJI should design protection for these factors, right?