I'm sure someone can explain this but I sure can't. I'm a rural flyer but this Phantom is so stable and predictable I had no issues flying it in the city for the first time today to get some video of my son's house. Turned it on and let it orientate on a cement slab. Didn't turn the Gopro on at first because I was just going to fly it around for them for a bit. Started it up, let it orientate in GPS mode. Got the total green and started it and let it idle. No problems. As soon as I started to power up the motors it went wide open went up and behind me so fast it wasn't funny. Tried every motion of both sticks in GPS with no response. It's fly fast to the south at what I'm guessing the "return to home height of 200ft." Switched to "Control Lock" tried both sticks no response. I read an article that suggested that I may want to make the "ATT2" position "total manual" just in case the on board navigation was unresponsive so it could be over ridden and possibly stop a fly away. And I did that several days ago. So I flipped it to ATT2 and it stopped it's fly away and I had some control. It was way up there and over a grocery store parking lot that honestly had every space filled. I started coaxing it back toward me and it seemed like it wanted to keep climbing although it was coming back with the right stick pulled back toward me. As I was getting a little uncomfortable with it climbing almost out of sight while it was coming back in my direction I tried switching to "GPS" and it took off like crazy away from me again. I then panicked and just shut the controller off hoping it would "RETURN TO HOME" IT FELL STRAIGHT OUT OF THE SKY. When the controller was switched off. Tumbling straight down to a crowed parking lot. Switched it back on and it powered up righted itself and took back off away from me and the parking lot.(Thank GOD!) Switched it back to ATTI 2 and it fell out of the sky tumbling end over end hitting a tree, and the ground. Broke the Gimbal clear off. I've only had it a week. I will get warranty but I'm scared to put my gopro (that is now scuffed up) on another one. Also today's liability issues over a full parking lot made me think twice. Has anyone heard of these taking off like this? Any imput on what to do would be greatly appreciated!! Thanks!