CameraGuy,
Sorry you suffered a crash. You only lost your ND filter as you say, but regardless, it's an expensive nuisance and I don't envy you the agonising time of watching it fly out of control.
As to the cause, and your next steps, I think you need to take a rather more scientific approach. Your video suggests that this was not a typical fly away whereby you lose the ability to control it due to a bad link between RC TX and RX. Had that been the case then switching the transmitter off would have meant it would have returned to home. People are talking a lot about TX and RX, power line interference etc. and all of those things are interesting and worth considering in other circumstances, but they don't match up to your experience. If you do seriously suspect those, and personally I think you're wasting your time to do so, but if you do, then you need to TEST it. It would be very easy to test if you've got a friend and both of you have a cellphone with a headset so you can talk to each other.
Instead, you need to ask yourself how a prop came off, without the hub of it being damaged, in the crash. This could only have happened if it was loose at the time of the crash. If you found the prop near the crash site then clearly the prop didn't come off when you first experienced a problem, but it might have been loose then. I'm not familiar with the phantom but if the prop isn't attached securely can the spindle spin without the prop moving at the same rate? If so then I think you have your answer as to what happened.
I don't think this is a systemic DJI issue - many people can testify that the fundamentals of their flight controllers, and the return to home function, works very reliably in most cases. The times when it doesn't are usually related to ancillary equipment, but clearly in the case of the Phantom this wouldn't be the case. Clearly they can and do go wrong, but in this instance I think you're barking up the wrong tree.
Hope that helps.
Sorry you suffered a crash. You only lost your ND filter as you say, but regardless, it's an expensive nuisance and I don't envy you the agonising time of watching it fly out of control.
As to the cause, and your next steps, I think you need to take a rather more scientific approach. Your video suggests that this was not a typical fly away whereby you lose the ability to control it due to a bad link between RC TX and RX. Had that been the case then switching the transmitter off would have meant it would have returned to home. People are talking a lot about TX and RX, power line interference etc. and all of those things are interesting and worth considering in other circumstances, but they don't match up to your experience. If you do seriously suspect those, and personally I think you're wasting your time to do so, but if you do, then you need to TEST it. It would be very easy to test if you've got a friend and both of you have a cellphone with a headset so you can talk to each other.
Instead, you need to ask yourself how a prop came off, without the hub of it being damaged, in the crash. This could only have happened if it was loose at the time of the crash. If you found the prop near the crash site then clearly the prop didn't come off when you first experienced a problem, but it might have been loose then. I'm not familiar with the phantom but if the prop isn't attached securely can the spindle spin without the prop moving at the same rate? If so then I think you have your answer as to what happened.
I don't think this is a systemic DJI issue - many people can testify that the fundamentals of their flight controllers, and the return to home function, works very reliably in most cases. The times when it doesn't are usually related to ancillary equipment, but clearly in the case of the Phantom this wouldn't be the case. Clearly they can and do go wrong, but in this instance I think you're barking up the wrong tree.
Hope that helps.