I shot this image on a GoPro camera in time lapse mode. It was at ISO 100, f/3.6, 1/950sec. I also happened to be moving the camera at very high speed during the shot. What is the ligher horizonal bar across near the top of the image? It can be seen right next to my finger tip and seems to go across the entire frame left to right. The defect does not appear in images before or after this shot.