@Tony I tried your suggestion. I couldn't get it to work. It appears to me that the base is programmed to be base, and the satelite programmed to be a satellite. So the satelite wouldn't work as the...

Thanks. I will try it. Doesn't seem, however, to explain why that location worked with no problem for over a year.

Purchased two units in Feb 2019 - one used as base, and one satellite. Everything worked great until a few months ago. Now the satellite unit goes to solid red randomly. Unplugging does not work to...