Video doorbell Pro will not turn on

I just installed my new Video Doorbell Pro, but I am not getting the flashing white light or the chime when I press the button. I had my transformer replaced, it is now at a steady 16V. When you first put the doorbell on the plate, the chime sounds, and a steady yellow light comes on for about 30 seconds, and then nothing. I have left it on the plate to charge for over an hour, the steady yellow light comes on intermittently and stays on for about 30 seconds at a time, but that's it. I have reset it using both the small and the large buttons on the back several times. I have tried connecting it directly to the port on the back, and nothing. When I press the button the chime does not sound, and I never get the flashing white light indicating that it is ready for set up. Spoke to tech support, they sent me a replacement. Same thing. Can both of the doorbells be DOA? Has anyone had this happen? Any solution ideas/suggestions?