This is 17 mins from a camera, compressed into 80 secs. IGNORE THE FLASH AT 33 SECs - that is the downstairs light being turned on briefly. These are very slight changes in the camera's position over a lengthy period of time. The camera is on a flat surface, away from anything that could move it and - as far as we can see anyway - shouldn't really have been moving in any way at all. Suggestions welcome.