First removed the control cover thinking that the internal plastic stops for the timer knob broke. (I recently had to replace the console cover because of a broken start button stop which caused the knob to rotate without starting) Stops where all fine. After reading further comments on this issue, I decided to remove and check the timer knob and observed that the shaft was cracked. Ordered a replacement from AppliancePartsPros.com. The part arrived quickly (3 days) regular shipping. Took a couple of seconds to push on to the timer shaft. Dryer works perfectly. (No need to order a metal sleeve; it comes attached with the new knob)