The dryer has worked fine with no issues for almost 5 years. We always use the automatic mode, not the timed mode. Last weekend the dryer wouldn't start when pushing in the start button. However, when I slowly turned the timer clockwise it started running at about the 20-30 minute mark on the timed mode area. It ran fine until the cycle stopped. After that, it worked perfectly all week on the automatic mode. Today, one week later, it is happening again. Any ideas?