My Lutron MACL-153M Dimmer Switch after 4-years of working suddenly stopped working correctly. Now it seems a small amount of electricity gets to the lights. They barely light up and flicker. I purchased a new Lutron dimmer switch and installed it correctly. The first time I turned it on it worked correctly. The next time I turned it on it barely lite the lights that flickered. I am puzzled about what has happened. Hope someone has some ideas to offer.