Larry, do you have your EHD or Hub plugged into the 3.0 USB port? It's the bottom one on the back of the H3. That is where it belongs. It sounds like you are sporadically losing continuity between the EHD and H3 and that is why you would see that message.I've been getting a notice lately when I first turn on my H3 saying it's found an external device. I have to click OK and then it goes to the opening screen.