Antwoord op "Stoped working at all"it happened to me months ago and finally fixed it today. The on/off switch consists of a piece of conductive rubber that makes contact with the circuit underneath. In my case the circuit or rubber became misaligned or dirty. Either way what fixed it was to disassamble the switch side carefully, remove the switch rubber, clean it and the circuit with some q-tips dabbed with alcohol and reassamble all. Deassembly was the biggest pain.