Well, got the replacement as you all know (around 2/20), and it was working fine. Right up until TODAY (3/18) Same problem as before. The on button stays switched on, and burns the atty out and overheats. To get it to shut off, I have to take out the batteries. I'm done. Can't trust it. I'll try to get in touch with the builder again, but this thing is going in the trash can.