PROBLEM SOLVED ON MIXER SWITCH TURNING ITSELF ON WHEN OFF. We have about 10 professional mixers at work and over time the mixer switch won't stay in the off position and flips itself on. Clive (above) had the answer for this. You just need to tighten the screen that holds the mixer switch arm in place. This screw is inside the machine. If you have a relatively modern machine, you don't need to dismantle the whole machine, just unscrew the 4 large (really large) screws that main part of the mixer onto the stand. You'll then see a handy little aperture that the wotsits at Kitchen aid have provided to tighten this screw (they obviously know this is a problem). Happy fixing!