I am starting to hate my tv. For years, I have had an appletv in hdmi 1, and Sonos in hdmi in the arc port. And it works. TV controls volume. All good.
2 weeks ago, added a second source to HDMI 2. Now the tv regularly “forgets” about cec and can’t control the Sonos. It will send sound, I just can’t control volume. Only when all hdmi ports are active.
I can’t find a solution for this.