Mine ran erratically from the day I set it up. It would function perfectly for several hundred rounds, then refuse to feed primers correctly until I quit in disgust. After eating dinner and calming down, I returned to it to try and figure it out, and it ran perfectly again for another few hundred rounds.
This scenario repeated itself every few months for about 10 years, at which point I decided that I was too old to put up with it anymore, and bought a Dillon.
No more problems.