I have a Phantom 3 pro purchased in early 2015. Haven't flown it in a while and took it out yesterday - was unable to see video feed from the camera using the original DJI Vision app on my iPhone or my iPad. The camera is connecting because I can pan and take photos, the drone flies fine - just no video feed. I downloaded the new DJI Go app but it will not connect to the drone. Need some help please.