Sorry to disagree frank, but it has nothing to do with wifi connection like you say, ive used several devices with my phantom both ios and android, wifi only, with cell network, i have a first gen phantom 2vision plus ( the v2 i suppose, the one without the wheel and the lipo on the controller) its almost a year since i bought it, hundreds of flights on it, used every app out there, and i have never ever had that happen to me, the black grey screen issue must have another reason, hardware related either on the bird itself or in the range extender, guess you got a bad one.