I had the same problem with my Vortex about 6 months ago and I contacted Kelsey about it. Kelsey gave me a very simple solution for this and since then the problem has not come back.
Solution - Go to the hardware store and pick up a small bottle of 3 in 1 oil. (It has to be 3 in 1 and not WD40 because the 3 in 1 will clean out any bits of sawdust that may be trapped in the nylon bearing). Remove your Spinner knob and put 3 drops between the blue nylon bearing and the steel shaft, do the same for the bottom bearing. Now give it a spin and I bet its as good as new again.
The Brrrrr Brrrr Brrrr noise on your MPEG was exactly what my spinner sounded like.
Thanks
Charlie