I have owned my VL300 for about a year and a half. Recently, when I was turning a bowl, I pushed the stop button and nothing happened, i.e., it kept turning. I discovered that the start button was stuck in the depressed position. Pushing it again caused it to pop back out, but of course the spindle kept turning until I hit the stop button. So, this kept occurring intermittently and eventually I called Ken Rude of Branches To Bowls who recommended that I open up the control box and blow it out, particularly the button. I then disassembled the button itself and discovered under the underside of the cap a little indentation which had somehow become packed with dust. It was actually the only dust anywhere in the control box. I cleaned it out with my fingernail and, voila!, problem solved. Thank you, Ken!