Experienced a sudden loss of video signal on DJI inspire 1 over the water. The app screen went blank along with no GPS data. Never seen this kind of failure before. VLOS could not be maintained as it was into the sun. Fail-safe RTH did not return it. The Inspire 1 was lost at sea. The flight log showed the distance of the failure was not a result of it being too far away, but rather a failure of the data links. DJI has not been helpful in telling me what went wrong after I filed a report of exactly what happened.