So here is the deal. I was flying my Phantom 2 with H3-2D Gimbal, GoPro Hero 3+ AVL58 +Prop Guards for over 15 minutes (I have a 2 videos from that flight of 3:03 and 12:21). Fully charged. I bought it one week ago. I was shooting at 2.7K 30FPS RAW PROTUNE ON. And at the end of my second video my phantom was at ~ 10 meters high and ~20 meters away from me and suddenly It started descending and also doing some moves side to side. I was trying to pull him up but I only could slower that descending. Then it landed on a grass and then flipped on the side. After that one of the props (black one) just took off in the air few meters from the Phantom. I stopped the engines and then I tested if everyting is ok for 1 minute of flying 1 meter over the groung. It was all okay, no damage and still flying. Battery was 1/4. So could that be the matter of flight time over 15 minutes? I charged my battery to 100% and I was flying after that for 10 minutes and shooting and everytignh went smoot but I still have a very bad mamory of that accident (Imagine what would happen If I was filming over the water...).