Hi, ive been out on site today shooting some video and stills. Everything was good for the first half an hour flying in gps. Then I started getting "atti mode" warning, the bird was moving about a bit, so I brought it down and tried again, but when I went to launch in auto mode, it went up 2 feet and then just dropped back down, so I called it a day and told the customer I would come back to finish. Now the site was a factory unit but with just fields surrounding it, some large trees, but I was no where near any power lines,mobile phone transmitters etc. It did come in with some heavy cloud (CB) so I was thinking it could be this, as I had moved away from the trees, i was down to 9-10 sattelites when usually im connected to about 18. Any thoughts, its the first time it has happened to me, every other flight ive made has been perfect, Mick.