Has anyone had a problem with short bulb life with the HS-100 smart mini plug?  I recently bought several to put my indoor Christmas lights on.  Interestingly, within days the existing lights started to burn out little by little.  Thinking the lights were just old, I purchased new lights and within minutes, I started seeing the same thing happen.  I only have one strand of lights per plug per outlet, so it should NOT be overpowered.  The breaker is not tripped.  Ideas?