Ok I am trying to get my outdoor Christmas Lights up. All of my lights are less than 4 years old. 5 sets (3 of icicles, 2 straight) have issues. On three set only half the lights work. The others 2 are just toast. Why are these things made so cheaply? When I was a kid it seemed like we had the same light sets for decades. I have already checked all the lights and the fuses I don't know why they aren't working. Does anyone have any suggestions?