The last two days when I sailed my Brigantine, the npc crew (3) assigned to the sails flew away and disappeared while sailing. Yesterday when this happened for the first time I almost crashed my ship trying to get the sails down that were unmanned and I was moving full speed. Today they disappeared again while sailing. Now I have a crew member hovering over the ocean sweeping and I cannot get them to follow me or back on the boat. The unseated crew members remained on the boat, only the seated and assigned to the sails are flying away.