I have a phantom 4 pro and use drone deploy to fly. Last week I was flying a site that required to batteries. The first portion went fine and the system returned and landed. I replaced the battery and started the second portion of the flight. About 10 photos into the first line the connection was lost with the Phantom 4 Pro. I hit the return to home button in drone deploy and waited. I got a re-connection message on the screen, but did not see any updated flight information. I waited about 5 minutes at the home point and did not see the system.
Someone approached me and said they saw the unit land in a pond. I walked down the road to the location and the system had sunk to the bottom of the pond. It appeared from the visual observer that they unit had simple landed along the flight line at some point. It was just my bad luck it was into a lake.
My question is what is the software supposed to do when the system disconnects during flight?