You hit something...or perhaps lost a prop. That Drone didn't just fall out of the sky.
If you believe DJI's decision was incorrect, you can try to appeal the denial by providing additional information.
Gather all your documentation. Collect...
That's a lot of personally identifying data. I don't think it's good idea to post that in a public forum.
Based on the video clip: it definitely looks like an impact from below/right. I'd still be interested in seeing the 20 seconds before...
I'm pretty sure that my understanding that small, single engine planes are not permitted to fly below 500' AGL ( aside from take offs and landings ) is correct, yet once a month or so I see these types of aircraft flying in my area and over house...
If you do a short flight ... even just a few seconds and post the recorded data, I can dig deep in the data to find the actual capacity of the battery to compare with the 3850 mAh capacity of a new battery.