I had the same problem with the on/off switch for the laser, it gets full of sawdust, gets between the contacts and stops working! A very simple trick is with the saw turned off, blow compressed air to either side of the switch and keep turning it on and off. You could use a bicycle pump if you haven’t got a compressor. Once all the dust has stopped coming out give it a try. Worked for me
Johnny B, May 2023