Saying Alexa STOP should solve your problem.
Well, sorry but that doesn't work if I'm listening to anything, unless I shout really loud. And even when it does hear me, that still doesn't stop the echo from responding to the next thing it hears. So, I still have to get up and go to the echo to hit the mic off button.
And of course that's what I'm asking this for, to avoid having to get up. When I'm listening to live shows I'm on the computer typing in a chat room, and not close to the echo. Since the show I listen to is Leo Laporte's tech guy show, he's always talking about the echo, and "echo" is my trigger word. So, I have to mute it one way or the other.
I know that the echo is supposed to be able to tune out noise, but that does not work too well, in my experience - requiring that I shout, which is annoying to me and others.
Just looking for a way to improve the experience. As it is now, I find I have to keep the mic turned off most of the time because my echo often thinks the tv or the computer is talking to it. I would also like to have it turn off on a schedule, since I never want it active when I'm sleeping. The echo has the ability to get smarter, I think being able to tell it to turn off the mic would be a useful enhancement.