Hello, we have an SP-15 used by college students in a typography studio. A problem occurs with the rollers when you move the carriage over the the bed. To start the rollers ink up fine and evenly, but as you begin to turn the carriage handle all of the rollers suddenly stop spinning. They seem to stop spinning regardless of being in trip or print mode. We have adjusted the roller heights and have given the press a good overall cleaning, but this is the first time we have had this happen and are at a loss with final projects around the corner. Any suggestions to help would be greatly appreciated!