I'm flying a stock PV2 with an iPad mini and DJI app. All software and hardware is up to date. I noticed when flying my fpv video will freeze and I lose connection. Normally at a close range. This last time I had a black screen view but the on screen controls for photo, video and camera control worked. Tried using an iPhone 4 and also an iPod touch with worse results. Anyone know what's going on and how I can correct this? I was doing aerial panorama shots at 225 ft. Altitude and had to rely on line of sight to guess the picture direction.