The video clearly shows you are way too low for flying above salt water.
Salt water mist into the drone. Drone dies.
Water droplets on the bottom sensor and you just may cause the Drone to auto-LAND.
TIP: DJI Drones cams have a zoom feature.
EDIT...
This past few weeks have been tough on the UAS industry in the United States.
Yesterday's IG post by a US Senator wearing a DJI mic sparked the creative juices.
I thought it would be good to start our week with a chuckle...
It appears # of Karens exceed Donalds; even we have a Karen in our neighborhood.
We could always compromise on a name and settle for Dorens or Karalds.
The concerning statement, posted by the OP was "Just curious why 400 feet. My area is flat, nothing above 60 foot telephone poles. I'm about a mille from an airport and helicopters fly over a lot."
So whether it was set at 400 ft or not, it...