ORIGINAL: At_Your_Six
...slow down the shutter speed.
As a photographer (rather than a videographer) I've never really understood what "shutter speed" means on a video camera. Is there actually a shutter blade that travels in front of the CCD? If so, I assume it travels horizontally across the frame and that's where the problem arises.
Anyway, it's just something I have noticed each time in your videos. It happens to bug me, but may not bother others. BTW, a related problem is the old "rubber prop" syndrome that plagues both video and still photographers (as seen in this photo I took a couple of days ago).