A few times lately my phantom went out of range and failed to return home. Today it went out of sight so now its lost. What caused that? It was in HL and GPS modes. After startup the green lights were flashing within 3-4 minutes and it took off and landed twice with minimal maneuvers before flying it further afield. When I tried to fly it back after some yaw maneuvers it wasn't responding like it was in home lock flight. Instead it was acting basically opposite to the directional control. Before I could get it oriented it was lost against the grey sky over a nearby lake. I switch the controller off as a last resort hoping it would return home but no deal. I didn't mess with the mode switches. I have no reason to believe there's any issue with the GPS signal around here. It's pretty wide open where I fly it. Last summer I connected it to the naza-m software assistant and some upgrade came along. Everything in the settings seemed fine. I have found the various instruction PDFs lacking generally. They're poorly organized and not nearly coherent enough for something this complicated and expensive. For instance the naza-m quick start guide v1.02 has 17 pages, how quick is that!! And it seems to cover a lot of stuff that's not applicable to my lost quad copter. The phantom quick start manual v1.5 is 15 pages long but the advanced phantom manual v1.4 is just 11 pages long. On p10 the lower right quarter page is in a red box titled "IOC FLYING NOTES!!". The first line states "LED will blink (green) quickly if recording is successful ..." Recording what? There is no reference to recording anywhere else on the page! That's one of many instances that makes absorbing the instructions a difficult task. DJI needs to do better with that.