Drone footage of impossible fast moving object.

I did not notice the object until I reviewed the videos that I had collected on the sd card in my drone. I was flying my DJI drone over the green belt behind my house when my low battery indicator came on so I lowered the gimbal to look straight down while descending to the takeoff point. The drone was at 300 ft when it captured the fast moving object that looks like white slightly stretched ball although that could be motion blur. The object is only visible in three frames of the 30 FPS I was shooting in. The object is moving much faster then any bird or insect I have captured in hd.
I recently watched a show called contact on the discovery network witch aired a segment of a very similar incident. A drone pilot was capturing b roll when he also captures a fast moving object. He also noticed it later when reviewing the vid. I believe have the same thing stored on my laptop and sd card.