I always made videos, so yesterday I decided to take photos instead...I decided to try out the Pano feature so the AC is brought up to 20 ft and the Pano starts and finishes. I then fly the AC 20 ft to the left and start the Pano again.... I notice the ACs rear LEDs are alternating red, green yellow, I forget which order but those 3 colors are flashing. So in order to bring the AC back to me I had to ascend 10 feet or so. Well, the AC start to go up and then when I released the stick the AC kept going up with no stick input. So I went throttle down and it descended until I let the stick go, it goes back up with no stick input. So i battled the AC to my landing spot and guess what.... as the drone was going down...hard landing... NO bottom sensors working... I finally shut down everything and restarted...the AC been flying ok since... I flew a least 10 times since ...but in a nutshell the drone has been a well behaved from day one...