LastChance4us wrote:
I had this problem and research it to find the true root cause. Remove the cover and carefully inspect the circuit board mount. I found that moisture is getting in between the circuit board and it’s plastic mount. The moisture sits right at the terminals that are the on off switch connector. I cleaned it, dried it and put a thine careful bead of sealant around this plastic rim and Vaseline on the terminal to resist moisture.
WD-40 works beautifully for drying out electrical stuff (the "WD" part refers to "Water-Displacing").
Silicone dielectric grease is another option for improving the long-term water resistance of the switch - It's thicker than Vaseline, and keeps its consistency even in very hot weather.
