Hello there. Newbie here. Have had the P2V+ for nearly three weeks. All went well until Wednesday last. When I achieved GPS lock, each time I put the Phantom on the ground to take off, the lights changed from flashing green to flashing yellow, and I was only locked to five satellites. I can achieve GPS lock after the horizontal calibration (solid green light) but after the vertical it goes back to flashing yellow lights - and five satellites. I have updated the firmware, calibrated the IMU, etc to no avail. Everything else is working perfectly. This is happening even in areas where there are no buildings, etc. Any help appreciated! Thanks in advance. V.