My wife's 240 wagon recently started acting odd. While driving along, the rear defog switch will light up on its own as if someone pushed it. Once it's on, the only way to get it to turn off is to shut the car off. (On a side note, the entire time we've owned the car, when you purposely turn the rear defog on, the switch remains lit until you turn the car off. Meaning you can't turn the rear defog off when the window is clear, is this normal?) Also, while it's on, various idiot lights will come on. It's happened twice while I've been driving it. The first time, the "service" light came on, but then went off. The second time, the bulb failure light came on, though very dim, and continued to flicker. Any ideas? Thanks ahead of time, without you guys, I don't think I'd be able to own a Volvo and my wife loves it.