I've had my Phantom 2 for about a week now. I bought a cheaper quad to practice with and watched 100+ videos. Out of the box I read the instructions and followed them to a "T", calibrated the GPS and took flight. Initial flight was successful. Same day, second flight I travel appox 30 yards forward and the Phantom just starts to climb on it's own. Hovers, then climbs again, and keeps climbing. I was able to turn off the remote and it returned. Just yesterday I flew approx 20 mins and was bringing it home. I got it about 30 yards away and it started climbing again, a few hundred feet up. Again, switched off controller and it returned. Has this happened to anyone else? I'm no longer getting the second beep sequence upon start-up, I have to calibrate GPS nearly every time I turn it on. Waiting 5 minutes upon powering up doesn't seem to help. I have intentions of using this for work but not if it's just going to act up every time I fly it.