Just came home from a beach flight. As my Phantom is less than one month old, this was the first flight which she ran out of my field of view - I only had FPV. But the thing is, I've seen that Phantom's OEM RC can go up to 1km range, but that's not what happened. When getting approximately 280m away from it, the Vision app showed some RC instability. I don't think it's any interference because there were no close cars and buildings were even further. Also, the antenna was horizontal and facing the Phantom. What do you guys think it was? Or is the 1km not reachable with the OEM?