B4 u send it in go get one of those precision oilers and lube the switch mechanism. Has worked twice for me so far...

If I may suggest -

My "A" switch started acting up a few days after I got my 300. Being the DIY/warranty voiding guy that I am, I took the thing apart.

The switches are tensioned by a small spring that sits in the middle of the switch barrel. There is nothing to hold this spring in place. It likes to get off to one side or the other, thereby causing the switch barrel to scrape across the spring as you activate the switch.This can cause the switch to bottom out against the rungs of the spring rather than against the solenoid switch on the circuit board. The result being that you have to hit it a few times until you get it just right and the barrel slides down the side of the spring, thereby activating the solenoid.

It has happened a few times since the first, and the best "fix" I have found is to flick the switch a bit - not step on it, or activate it, just flick the head of the switch. After a few tries it will put the spring in a place where it doesnt impede the switch action.