Hello, We are having continued chronic problems with our Phantom 2. The unit worked great for the first six flights, but now is uncontrollable. Basically, in GPS mode when hovering, the Phantom 2 starts to fly in an ever-widening circle, picking up speed as it goes. This is without any input on the controls. Also, when flying in a straight line, the Phantom wants to fly slightly sideways. We have gone thru exhaustive calibrations and upgrades. All parameters on the software seem to be in order and within spec. We've calibrated the compass over a dozen times, and get a reading of 10 satellites for the GPS. We loved it when we first got it, but it is unusable as it is now. Anyone have any ideas? Thanks.