I have several 2473 Outletlinc receptacles that seem to function fine. Two of them have LED Christmas light strings connected to them. They turn ON just fine. When they are turned OFF they seem to go off, but the LED lights still stay on, although very dim. It's as if there is a small leakage in the 2473's. Anyone else notice this behavior and is it normal. I'd really like them to turn 100% off.