It looks like just a case of low light so vision system not working along with low gps count that caused unsteady movements in your drone, and ultimately a fly away.
Unless you had CSC turned off on your app RC you should after crash been able to shut your craft down, it only works in emergency situations similar to your crash.
In areas where gps signal is likely to be blocked you need to have reasonable light for vision sensors to create good hold of your position, so two things going against you 1/low gps count 2/ low light.
For dji drone to work safely with gps you really should have minimum 6 satellites , but because you can receive two different types of sats glonass and gps, on your telemetry you should be looking for minimum 11 which insures you have at least 6 of one kind, but more important and easier to check is small graph bar which should have 4/5 bars lit up white.
Hopefully your drone is ok and it lives to fly another day .
Loss of GPS Loss of GPS will lead to DRONE drifting with the wind. Inertial Monitoring Unit (IMU) will maintain aircraft stability. Return-to-Home function will be lost. GPS signal can be lost when operating in mountainous areas, built-up areas, forest areas and any other areas where GPS signals are blocked. Vision positioning systems may not work if heights in excess of 5m are maintained.
Actions • Maintain lateral position using right stick (mode 2) control inputs • Land as soon as practical
Forced Landing If the stability of the DRONE is in doubt, it is best to attempt an immediate landing instead of returning to land at the assigned landing point. Delay in landing might allow stability issue deteriorate further. Suitable Emergency Landing sites Should always be identified and briefed prior to flight. Actions • Route to pre-determined Emergency Landing site • Land
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