This dimmer is controlling a dimmable LED bulb. As long as the light is illuminated all is well. The dimmer is fully functional. When the light is off, for some period of time, do not know for exactly how long the switch stops working. All the lights on the left of the switch are blinking. Resetting the switch by pulling the power tab generally restores functionality and allows the light to be controlled again. Any ideas/suggestions? Is it simply a defective dimmer?