Mine is intermittent. Specifically when wet. It can actually blow bubbles or squirt bits of water.
I think a fix could be to inject very thin silicon caulking after drying it out thoroughly with maybe a syringe. It would set so you don't get oil on your finger every time you press the button but also will stay flexible enough to be able to click the switch. However i would really really like to see someone taking a door lever apart to see what switch is used and how the button cover looks like from the inside to see if a method of sealing can be applied in a more technical manner.
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