Hello, I bought my Phantom from Dronefly about 2 weeks ago. I love it but it has just developed a problem. After a normal start-up, no red lights and after home spot has been marked with the rapid green lights – the phantom flies normally in GPS mode with no problems. However when I climb the unit up to about 80 feet or so, it loses satellites and I get the red lights. Sometimes just one, sometimes two or three. When this happens the phantom will not hold position and flies like it is in ATT mode. There are absolutely no obstructions to the sky. There are no power lines nearby. There are no large buildings at all. When I bring the phantom lower (around 30 feet) the red lights go out and GPS mode works fine. This condition happens every time I fly. I have upgraded the firmware to the 4.0 per the instructions and also performed numerous compass calibrations and basic and advanced IMU calibrations. No change. Any ideas?