I have a Maestro dimmer installed for approximately 4 years, worked perfectly until recently it started to turn on by itself to the lowest dimmer level. I thought the dimmer was defective and purchased and installed a new Maestro dimmer. The same issue happened immediately. Shut off the lights and moments later the dimmer would turn itself on to the lowest dimmer level. The switch operates 3 counter lights with 3 incandescent bulbs in each light. What could be the problem? Thank you