It could be for sure the knob on my Performer which I bought used it would hardly turn on or off kept spinning unless your really gripped it tight. You don't need to turn it that much for off and on by the way. Turns out and I found the fix on the Web was that after years of use the knob starts to slip on the brass stem people turning it to much both ways it was an easy fix.Scored a Performer Deluxe with the gas assist. Among trouble shooting some areas, I discovered when attaching a new small propane tank it would sound like it's opened already. Faulty tank or bad knob for regulating the gas?? Any help is much appreciated.