I've seen this posted a couple of times in brickboard and it's also happened to me. The 850 glove compartment door has a hadit of warping and when this happens it no longer turns off the lamp. It used to drain the battery if my wife only drove a few short trips each day. Drove me nuts until the light finally burned out. I replaced it and the problem started all over again!! Use some double back tape and stick a spacer in the corner of the door in front of the switch post. A penny works fine most of the time.