Looking at the logs CSV and Health Drones a few things are apparent,
GPS Dropped from 14 to 8 satellites, at the same time there was a voltage drop of over 1.2v on the battery, battery cell 1 dropped.
More interestingly your battery temperature reached 103.9F, thats max operation temperature.
You then had compass errors but that may have been from it spiralling down,
My Opinion is you either had a birdstrike, Prop loss or a battery failure
Edit looking at your vid i say possible bird or prop loss, i can see power in the arms LED's, id bet prop
You need to speak to DJI but they generally don’t cover you unless they can inspect the drone
I hate to say it but flying over water at night is a huge risk and is asking for problems
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