Lynn with the CV cool do a very short button press then pull the top up and see if you can tell if it got hot in any particular place.
Also check the screw on the bottom of the switch. Maybe loose? Should be snug but do not overtighten as it screws into a plastic button.
Also check the screw on the bottom of the switch. Maybe loose? Should be snug but do not overtighten as it screws into a plastic button.