@frolix8 Just want to make sure, are you using the supplied adapter for power, or are you using the power straight from the TV?
, I'm using the square, kind of flat Google-supplied power plug... That said, I tried what I'd read online was a bug, and unplugged the power plug, waited a few seconds, and repluggef.... Message is gone!
I have the same issue... But pluging out the power supply and waiting a few minutes does not help...
Also factory reset did not help...
Also using the Founders Edition Chromecast Ultra and it's power supply