This is enough to take away the joy of flying your H Pro. I flew one battery and then another. My H Pro flew without any concerns. I flew both batteries to 14.7v and then changed out for the 3rd. Each time I took off in Angle Mode with O/A off. Went up to about 20 ft and raised landing gear. I did the same thing on the 3rd battery. Took it up to 20 ft, did not even have the chance to raise the landing gear, when suddenly the H tore off like "a bat out of hell" to the east at an incredible rate of speed as if GPS was not on. On my ST 16 is said GPS was on. The H would not hover and continued to fly with a mind of its own. I tried to reverse the direction. It did respond a little with a lot of lag and flew wildly and continued to drift even when the direction was reversed. So I think somehow there was something that was interfering with the GPS and ST 16 commands. The H then took off to the west at a high rate of speed. I was able to increase its altitude to about 170 feet; all while I was trying to bring the H back to me but it would not respond. It kept going this time to the southwest. I could see it LOS but it was quite far away, about 1,500 ft. just barely on my development's side of one of the busy streets. I lost telemetry on the ST 16. Everything said NA on the left (drone) side of the ST 16. I tried RTH and it would not respond. I tried to turn on OA but got no signal that it was on. Then I got an alert that said Real Sense was not on and to restart the aircraft. (Not sure what that meant, but I knew I had better not touch the red button!!! If I had done that, props would have stopped and it would dropped like a rock!!!) I switched GPS off and then back on. I tried smart mode, then put it back into angle mode. I moved the OA switch on and then off. I had no control over the craft. I was watching the battery voltage and it was down now to about 14.9v then 14.8v. . I was worried the battery would run down. I was thinking I would never see this H again. I then switched the Tilt Mode of the camera. I then was able to move the camera straight down and saw that the H was still inside my development but still quite far away. I could see the craft was now hovering in the same spot because the image on FPV with camera pointed down was not moving. I tired RTH again and now saw the H start to come back in my direction very slowly (about 7 mph). I started to feel less worried now as I knew I could get to the craft if the battery got too low and it landed on its own. But I was able to get it to come back to me. However, not trusting it now that it would behave, I wanted to land it as soon as possible. I brought it to about 30 feet from me and landed it. What a relief. Until it happens to you, you have no idea what it is like. As I said it is enough to change your "love of flying" to "fear of flying". I just don't trust it anymore. Please let me know if you have had a similar experience with your H Pro.