I'm sick of seeing this "UFO." The "smoke trail" looks suspiciously similar to the trail left behind by your finger when you drag it around an LCD screen. There is probably a drop of water that found its way behind the lens and froze. The wind whipping around at high altitude is putting random pressure on the optical sensor and moving it around. you can see a visual distortion shadow in the top left caused by the lens being warped. I may not be exactly correct but I am directionally correct. It's easily explained by a mundane physical malfunction.