Had an "oh-crap-i'm-gonna-crash" moment today. I did the usual pre-flight checks, compass calibration, and the wait for the green slow flashing lights before taking off at this beach area where I've flown before some time back. The last time, I took off at the usual spot and had zero issues, no GPS loss, whatsoever. But THIS TIME, I got 11 satellites locked prior to take-off, took off and hovered around the sea to check if it's stable and maintaining its position, but something odd happened when I attempted to turn back. When I turned the quad to face me, all of a sudden my quad started drifting away from me really quickly. then I realized that the green flashing had disappeared and changed to yellow. thank god I regained control of it. Then turned the quad away from me, with its back facing me and all of a sudden i got back my 11-12 satellites. Okay, I thought maybe it's just a one off thing. But when I turned the quad back to its front facing me again, my satellite count went to zero wtf? Had to fight the wind to bring it back to land. this is incredible puzzling. It's a freaking beach, an open area. Furthermore the last time I flew there, I never had this mysterious GPS lock disappearance. I decided to take off from a different spot this time, somewhat 200 meters away and this time it flew flawlessly with a solid 13 satellites locked and never had any drops. Anyone can explain what's going on? I'm guessing this sudden loss of GPS is the reason for all flyaways caused. Thankfully I was alert or else mine could be the next one to experience this dreaded flyaway.