Had this error on boot up today, and in middle of large field ... No video, no info on many of the data pages ... BLANK ... "Disconnected" error ... after extensive checking all controller pages w/o finding any info, motors started and hovered OK ... landed and further checking found iPhone lightening cable not fully plugged in!!! Pressed in and all OK ... NO IDEA WHY THIS ERROR?? I suspect common problem as lightening cable is difficult to fully seat ... need to check every flight I think...