Fog came rolling in and the Phantom 4 disconnected from the remote.  Was still able to view video feed, but unable to control the drone as it returned home.  Even in heavy fog the Phantom 4 "call sign mogi" mesquito in Korean was able to avoid golf netting.    

Hello Farout4u, the remote cannot control aircraft when they lose connection with each other, but it will be recovered once the remote links to aircraft again.
Please pay attention to the environment around and setup "return to home" before flight.

Natalia,
Understood, nothing wrong with the Drone; it did exactly what it was suppose to do.  It was my fault for setting the return home height on the Litchi App to low.  Just glad to see that the accident avoidance sensors worked as advertised.  It recorded its home point before take off just like it suppose to.