Have had my Streaming Stick for about a week now and ran into this bizarre problem today. Since the day I set it up it has turned on and off my sound bar and tv. Was able to control HDMI-CEC sound and use vol up/down from the Stick but not optical.
Today out of the clear blue it won’t power off anything but it will control the optical volume through the sound bar. It doesn’t turn on or off the sound bar or tv anymore.
Edit: Disconnected Stick from input. Waited a minute and put it back in. Took batteries out of remote and then repaired it. Did the setup to control other devices and now everything works the way it used to! Too bad it doesn’t control my optical anymore but at least it’s useable again.