i checked it out the day before yesterday, and saw scorch marks on the base of the plastic bit that gets seated into the socket. I wiped off the connectors, plugged it back in, and it worked.
Until yesterday. Then it goes out again, and I replace it completely when I get home from work. Oddly enough, when I made sure the bulb was completely seated in the socket, it wouldn't work, but when I pulled it out just a millimeter or two, it did.
Until today. It's currently not working, and I'm torn between going out to adjust the damn thing or just whacking it to little shimmery bits with a hammer.