Yesterday morning we had a rather strange experience with our Vandercook SP-15. It was about noon and the studio was just starting to warm up. Temperature was maybe 50 degrees when we started the heater. After a bit we inked the press to print some notecards and what I think was the vibrator roller (pretty sure but it was quite hard to tell) would want to stop and would squeal. We put new Vaseline on the vibrator roller and oiled everything else. It would stop for a moment and then start back up. You could see the vibrator roller wasn’t keeping up with the rubber rollers.
Maybe after 10 minutes it stopped. Do you think running it for a while warmed it up and that cold ink / cold press is the problem?