I want to preface that I'm a very new drone pilot. I just got my Phantom3 Pro last week and have had 4 serious flights. My first flight was in IL and it was flawless - flew great (besides my lack of knowing the controls) and returned to home just wonderfully. I brought it with me to CO and tried two flights in the Rocky Mountains. The first one was up very high - around 11,000 feet elevation. I took off from a parking area and I didn't get out but 200 feet and it said "Disconnected" on my screen. My heart dropped. I tried sending a RTH command and nothing. Luckily, I could still manually control it and see it so I landed it myself. Talk about a scare. We drove down to lower elevation - about 7,000 feet and the same thing - I have video on my phone, GPS is good, ready to fly. I take off fine, then I fly off and it shows disconnected again. I went ahead and flew it manually for some video this time (luckily I hit record before I took off). I had full control of gimbal, all controls, just flying "blind." I'm certain I'm on the latest firmware as I updated as soon as it shipped - Monday last week. Any ideas? Was the elevation throwing me off or do I have some other issue?