Push button on RO sticking

[Maplewalnut]

Heres one for you....the pump start push button on my RO panel is getting increasingly difficult to push in and activate the pump. I sprayed a very little wd-40 around the green cover but it didnt seem to help. Any ideas?

[maple flats]

Take the cover off or switch out and inspect it. Maybe even some canned air blown in around the switch might blow out something that is interfeering.