What a bad day for me. I'd been flying around totally normal for about 10 minutes. I was doing a nice slow pan about 30metres up, not far from me. Suddenly the engines cut out and as it fell - I SAW TWO PROPS FLY OFF!! The phantom is a total wreck but more of a concern for everyone is what happened. After about an hour I found both props. They had landed about 100m from the crash site (there was a bit of wind which would have helped to carry them) and about 10 metres from each other. They were like new - I can screw them back on the phantom just as normal - nothing was threaded etc. They had been tightened to the same amount as always - hold the motor and make sure they are snug. So what happened - I assume, contrary to what DJI claim, the props can loosen and given the particular flight maneuver you are doing can come off. I assume that once they are off somehow this can lead to the engines failing. It doesn't appear that two of the motors locked up and this is why they came off because the motors still turn by hand nice and free. Of all those people out there that have experienced a sudden fall from the sky is there anyone who had a prop missing when it landed? If so this could be the reason.