As the title suggests, my Roku stick randomly will show "thinking" and then turn off TV when I'm watching.
I think this may have something to do with the Alexa skill, but am not sure. I haven't figured out how to reliably recreate the problem enough to test.
Yeah, I've never seen such a message, but I don't use Alexa to control anything in my home. But it does sound like that could be it. I've never seen a Roku message of any kind with that wording, so it would seem likely it's coming from an external source. In fact, if it is Alexa, it's likely doing it at the TV level and Roku has nothing to do with it.