What would cause a Phantom 2 Vision Plus to loose contact with the controller during a sudden descent because of low battery? I didn't have time to look at my iPhone to see what was going on. The drone was less than 20 feet away and no more than 30 feet in the area above me when it suddenly started to descend. Yes, the red lights were flashing. My control sticks seemed cut off all of a sudden from the drone,,,,any ideas about what happened. I have read of similar incidents, not exactly like mine, but I sure would like to know how to avoid this!