WPM, I had the same problem. I had an alarm clock that went off when it wasnt set. I shut it off, went back to bed. It goes off 20 min. later. I get up, shut it off, got a screwdriver and took out the batteries. It goes off 1 hour later. I freak out and shove on a shelf in my closet. It is still there, and hasn't made a sound since. Creepy, huh?