For some reason, this problem intrigues the troubleshooting part of my brain.

BTW, my first career was in electronics, and I still do it as a hobby, so feel free to get technical.

OK, I just took a look at the QTronics web site. Could you tell me more about the application and environment for this particular box? I am working for the moment from the assumption that the box is working fine, but being falsely triggered from an external source, and I can think of so many possibilities off the top of my head.

Brain