Better late than never I guess
Had a similar problem, that has worsened since then, in my case it's the switch itself that is the problem. Seems like the switch is of an inferior quality.
But wouldn't recommend to solder it off just yet, maybe check if there's gunk in-between the switch and the switch-arm.
The switch-arm that is visible from the outside of the device is like an adapter that is connected to the switch on the pcb, in order to limit the amount of dust to enter, and to make it look pretty..ier