Based on information provided thus far in the media and a review of the video, a shift in the cargoload seems a likely cause of the accident in my opinion.
During that time, astronauts will load about 2, 300 pounds of cargo back on the ship, and then it will return to Earth on March 25, splashing down off the coast of Baja California.
Some of the ferry's cargo of 50 lorries broke chains holding them down and as the load shifted the vessel began to list at 60 degrees in conditions described as the roughest for a decade.