I have two motion sensor porch lights at my home. They've worked fine for 6-7 years. I use bug lights in them and they generally last about a year. Recently, the lamp on my back door has started eating light bulbs. I replace the bulb and it burns out in a week or so. I'm stumped. Why would a light fixture suddenly start burning out bulbs at such a fast pace? It is on an original circuit that has always been on the house. For years, it worked fine, but has suddenly started eating light bulbs. The identical one on the front porch works fine. Is it possible that a wire connection has become loose? I don't see any damage, or charring on lamp socket or connectors on the light bulbs. The lamp is probably working as when I go outside and it senses my movement, I can hear it click.