Hey Very new to Phantom 2 Vision plus - and today when I was outside this is whats happening: I calibrated my Phantom and it all light up green... then I started to fly - and it was some wind - not that much. Suddely the phantom did not respond to the gps and drifted away. then I lost contact with my iphone and the phantom. then when I got it down - I saw that the led was blinking slowly green for like 5 or six times. Then it started to blink green again. So what can it be?