Somethingvery strange happened on 29-01-2015. I did a couple of flights int he morning and charged my batteries for another flight in the afternoon (have2 x batteries). Ihave a GoPro hero 4 Black edition attached to the Zenmuse H3-3D Gimbal. I do what I always do, pre-flight checks, compass calibration, wait for my satellite fix. all was good. I took off to about 50m high and hovered. I did a few small movements left and right, busy testing the hero 4 photo and video capabilities (still new camera). I slowly flew away from where I was standing, about 50 -60m away and maintaining the 50m altitude. All of a sudden the Phantom 2 just flew away from me, the swooped to one side and dropped out of the sky and went full speed towards the ground, I immediately activated "Fail Safe Mode". Nothing happened, it just went down........ it crashed on the roof of a house a block away from where I live. Found the battery on the roof (the battery led's still indicate 90 - 100% power), the Phantom in the garden, the Zenmuse Gimbal broken and bent on the drive way, the GoPro wrecked. The Phantom blades are broken, the motors are stuck due to bent "arms" . It took a serious hit. So now the GoPro does not work at all, I inserted the SD card it into my PC to seethe video of the incident. The video shows: me taking off, up to about 50m altitude, hovered, then my little movements, all still good. Then I flew in a Southerly direction for roughly 50 - 60m, all still good on video. Then Video just STOP! Like the Gopro has been switched off..........all still at 50m altitude....... The Gopro and Phantom battery was charged to 100% before the flight, this all happened within 1 minute from take-off. I fly this Phantom. I am very familiar with the procedures of calibration,satellite fix and pre-flight checks. Oh and the Phantom is in Phantom Mode NOT Naza. I am a ROV (Remote Operated Vehicle) Pilot Offshore in Oil and Gas. I am very familiar with flying and robotics. The Firmware on the Phantom and Zenmuse was up to date. Any ideas as to what could have happened? I'm taking this up with DJI Support!