I had the same thing happen. My machine is about three years old.
I emailed Schatten, and got a reply. They wanted me to send the winder in, but it was still working, albeit slower than usual, and I had pickups to wind. So I opted to get a new motor from them. Les Schatten even called me to discuss it.
That fixed the problem for about a month, but then it was worse than before.
So the real issue is the motor speed control. He thought that might be an issue.
Now I have a variable speed drill attached to the left axle to power the thing.