Lost my Phantom 3 today. Have no clue if it's firmware related or not. I upgraded to the newest firmware last night just to be totally updated for a job I had today. Locked GPS and took off, flew out to 5k feet towards a bridge, then flew back, got to 2k feet away and dropped signal. Waited and walked around a few minutes to try and get signal and nothing. Initiated return to home in the app and it failed. Hit the rth button on the controller and waited 10 mins, at this time the battery should have been dead. Finally turned off the remote and waited..and waited, bird is now gone The altitude when it lost signal was just over 520 feet. I have 2 theories...It appears that it lost signal or went down possibly over an underwater transmission line, as there is a clearing in the trees at exactly the location it went missing, and if you look across the gravel road, there is what appears to be an electrical junction box. Either that or a bird strike, as I saw several eagles in the area. Any other thoughts?