Lost connection on mission

Today I was flying a short mission in what I believe to be optimal conditions, with the possible except that I, and much of the mission, were over water. The highest point of adjacent land elevation was quite low (~10m max). The mission covered less than 10 hectares. After starting the mission I noticed that the red icon for the Phantom disappeared for a moment, but reappeared at the proper start location and the mission began normally. Just about 2/3rds into the mission, however, it happened again. This time I noticed that all connection displays (the right side of screen) were gone, the red icon was gone, and the camera seemed to be at 90 degrees to the normal downward facing position. I could see the drone clearly about 350m distant and it appeared to be continuing to follow the mission path. From the photos, however, it appears to have stopped recording at the point it disappeared from there display. I manually brought the drone back visually but am not sure what I would have done had I not been in visual contact. Any thoughts? I have a screen shot that shows what the display was at the time at https://www.dropbox.com/s/9q4t4chrywaiknm/IMG_1869.PNG?dl=0 . - David Remsen