I have the Phantom2, and I got some problems with calibrating the compass. When I was trying to calibrating the first time I did a mistake because I was thinking S2 was S1. I rapidly flip the S2 up and down six times and the LED indicator changed to blinking red Then I did it the right way with the S1 and the led indicators changed to solid yellow. So far so good. Then I hold the phantom horizontally/rotate 360 --> Solid green. Like it should be. But then when I did the same, but vertically i got Red/yellow blinking light. Any ideas for what can I do?