Anybody have problem with a very low hi-pitch static noise within 3-4 ft of dimmer switch PD-6WCL? The noise is from the dimmer switch itself, even without the bulb. The wiring is correct. Sometimes I am even able to here it at the opposite corner of a quite room. It has been working fine for a week now. I am just bother by the noise every time I walk in the room. Anybody have a solution?