After the compute is on for a long period of time (a week +) the dots movement will become less smooth to a point they become choppy and wont make the full motion anymore. Its almost like their frame rate drops to like 5 FPS but you can tell there is an issue with their physics as they will no longer spin around to make a full circle to the screen. They almost start making a oval before they rotate the other way to do the same. Simply restarting wallpaper engine or the computer resolves the issue. I have not tried changing to a different wallpaper and changing back though I suspect that will work too.
Now I do use my computer as a MCPC so its hooked up to a TV and AV Receiver and turning them off may cause this issue but I have my doubts as I haven't experienced anything like this with other wallpapers.
Overall, even with this issue, I still love this wallpaper. Best one I've had yet!!!!!