Have you tried Healthy Drone.com
Sign up for free. Assuming that you still have the data on your phone or device, upload that and it can give you a very detailed analysis of any error messages and signal losses second by second - a bit like an black box
If there is nothing sinister or obvious (i.e. It just goes dead) then I would suggest battery failure or disconnect.
Was the camera recording? Did it record until impact, in which case not a battery issue.
We're the blades damaged heavily and equally in the crash? One being less damaged might suggest a blade failure. We're any loose? Did you see it come down? We're the blades spinning and engines whining?
Either way, sorry to hear the drone is broken.
Sent from my iPhone using
PhantomPilots