Thanks for the help.  It was the Apple TV.  Somehow it got activated for 15 minutes.  I don't know how, I've never used it.  Anyway, problem solved.  Thanks again ... View more

I access Pandora through Apple TV 4.  It shuts off after 15 minutes, as if the sleep mode is set for 15 minutes, but the sleep mode is NOT activated.  The Pandora version is 1809.1. Connected to 5g wi-fi. ... View more