If it's any consolation, I regularly fly near metal rooftops & metal high tension distribution towers... so far without incident. I've also seen several YouTube videos of Phantom Vision's flying over rural & industrial areas, complete w/metal rooftops, powerlines, cellular towers etc, again with w/o incident.
I had no idea there were so many videos of Phantom-1 fly aways on YouTube. After reading other forums & viewing many videos it's difficult to come to any definitive conclusions. But I've gotta say the following convinced me there was no pilot error involved;
http://youtu.be/JnDM7RIgJ5w
http://youtu.be/RCt-XluLyA0
http://youtu.be/CInwaLBlPxY
I could understand shorted windings in a motor, an ESC failing from a weak FET or cold solder joint, these would tilt the PV and 'tho the autopilot would try to compensate, it would no doubt make a diagonal descent into a tree, etc. But the fly aways where the aircraft is calmly hovering then suddenly takes off in a new direction sounds like it thinks it's in the wrong place, so it tries to "fly back" to the "proper" coordinates.
I'm only guessing here, but it sounds more like invalid GPS data, as the compass only provides the autopilot with a heading (0-360), but not the XY coordinates of where it should be. Else the compass is outputting erroneous data causing the autopilot to fly in the
wrong direction to hover over your current XY coord, only to start flying it in the wrong direction and finding out the XY values are going backwards, run loop again... fly in direction indicated by compass, XY coord's don't improve, run loop again... I'm just blabbering out loud, trying to make sense of it. One piece of data that's missing from all this is whether or not the pilots performed a compass calibration prior to the runaway flight. If that's the case, there may be an issue with the compass calibration procedure maintaining the new calibration.
Very unsettling that Phantom-1's did this, and now many reports of Phantom Vision's doing the same thing as well. Between the RC community & DJI I certainly hope we get to the bottom of this soon.
iDrone