I have a well used Rio (mazzer) super jolly. I have gotten a couple of weeks of solid use out of it but today I go grind 18g and it won't start. No motor hum, silence. I checked the plugs, working fine. I backed off the grind adjustment and that seemed to correlate with it starting again. Then it stopped again. It has an on/off switch on the side but doesn't act like a timer. It is from 1996.

I'm not so good with the electrical stuff but will open the base later tonight. Anything I should be looking for in particular?

Help is appreciated!