Hi all. I've noticed that recently my Jet 1221VS slows down during a fairly light load and takes longer than usual to come back up to speed. The problem has been worsening as time goes on. I have blown out the belt area and routinely blow out under and around the switch and VS control. It FEELS like belt slippage but the tension feels right and is set according to Jets specifications. Has anyone else had this problem on this or other lathes? Thanks in advance!