Hi all, I just had my Phantom 2 Vision Plus fly away on me. It's been over 40 minutes so it's no longer in the air. I made sure I had a good GPS lock before I took off, had 7 satellites, and the compass had just been calibrated. It indicated "Ready to Fly" by slow blinking green, but a spent a few minutes adjusting the camera parameters before taking off. It slowly blinked green with 7 satellites. The flight seemed fine for the first few minutes. After 3 minutes of flight the FPV video got crappy. After 30 seconds with no FPV and no visual I turned off the controller to activate fail safe mode. It never returned. My questions are: 1) What does the phantom 2 vision plus do when it can't get 6 GPS satellites to lock by? What happens when it has 5 ? If it doesn't have six, what EXACTLY will fail safe do? 2) How does it know what altitude the ground is? 3) What altitude does fail-safe "land" at if I take off on the side of a hill? A) the altitude it took off at? B) the altitude of the ground at the location it's at? C) or ... 4) When the battery is runs out does it lower itself x feet per second, or just shut off in mid-air and fall like a rock? Any insights would be appreciated. I'd like to better understand my $1000+ problem.