BLUF: Phantom flying near rock ridge in mountains, wobbles violently uncontrollably about 30' high, doesn't respond to any control inputs including my full throttle left stick up to ascend.. it keeps wobbling while descending.. hits rock ridge (side of mountain), tumbles down about 15'... Battery ejected but good. 3 broken props, gimbal and camera NOT harmed!!!! Thank you, thank you, gimbal guard!!! Screen shots of Assistant Software here: https://picasaweb.google.com/srandall31/ScreenShots02 -- Connected phantom to computer with software running and powered phantom for first time since crash... -- States it's in failsafe mode... and compass error!! -- Recalibrated compass & did an advanced calibration - compass is now good... I had to use a magnet... followed Colin's method.. https://www.youtube.com/watch?v=kCT1rRE_UIg Ok, so this same thing in almost the same area, happened to me once before... I sent the phantom back, got a new one. The new phantom has been flying flawlessly... flew 3 batteries perfectly fine today. Installed 4th battery (fully charged)... at around 50% charge, 30' high, near the side of a rock ridge, this violent wobble happens. It appears something may have disturbed the compass.. some signal interference of some sort; however, I'm not sure if the crash itself could have caused the compass calibration to be off and there might be some other problem. I would like to think that it was some outside interference with the compass because that would mean that there is nothing wrong with the phantom. Just not sure... I hate when this happens because I lose faith and afraid this can happen again... I was flying NAZA mode, both switches full up... when wobble happened, I switched to ATTI, pushed up on left stick to ascend, and nothing changed... still wobbling and falling... I'm reliving the same nightmare I had with my first phantom.... again, I hope I chalk this up to a fluke outside signal interference with the compass... Your thoughts?