I was doing a night flight at my house so I could do a video of the city lights from a distance. I started up my p3a and it did its checks and everything checked ok, it found 19 satellites and all the sensors said they were ok. I flew my p3a straight up, I was at around 400ft when I noticed on my screen the distance was increasing and I wasn't touching the stick to make it go anywhere. I could see the lights of my p3a and sure enough it was going further away from me. I hit the return to home button and I also held the left control stick down to bring the p3a back down. It eventually came back but not sure why it would just start flying away on me. I am running firmware version 1.4.