Trunk Mounted CD changer?? Keeps changing, even when the car's off.

Hello, My '96 SL has a 12 disc CD changer mounted in the trunk. Sometimes, but not allways, if I leave the CD's in the unit, it'll keep switching between them, even when the car is off. Nothing else is on, in the car, but this thing keeps shifting through the CD's. Even if the CD holder is empty, but inserted into the changer, it shifts through them. Is there a way to shut that off, that I'm not aware of? I thought that just shutting off the car would turn it off, but it doesn't. It's run the battery down a couple of times, so I've needed to jump it. It seems to eat up a lot of power. When the CD Holder isn't in there, it doesn't seem to drain anything, and right now, I've got the player itself unplugged, so it can't drain my battery. Still, it'd be nice to play CD's. The manual is very vague about the thing. Says how to switch to CD, but not how to turn it off, or make it stop the constant shuffling. Any thoughts? This is turning out to be the worst car I've ever owned. My brother swears by Saturns, but I just seem to swear AT mine. Tedrick