Hi guys!
My friend got my "old" Phantom 2 Vision+ V3 when I purchased the Phantom 3 Professional.
We tried flying together today, but everytime he was up in the air I got interference / static on my screen. Even some red warning (can not remember what it said). When he powered down I could fly like normal again. Happened twice. He did not have any problems on his screen. Both iPhone 6+ running lates firmware and app versions on both.
Is there any channel / tweaks that is needed before two Phantoms are up in the air?
In the menu section of the P3 there is a setting under the "HD" icon that is called "Image Transmittion Setting". Try changing from "Auto" to "Custom". I'm successfully using channel 13. I'm just providing this as something to try, not sure of any possible ill effects.