Try unplugging the TV and Arc from power for a couple of minutes.

Will try doing that

These happened gradually

First the audio thing

after few days unable to turn off tv using Alexa from arc

Regarding the TV turning off via Alexa, I had a similar issue that started a while back.

I used to be able to say “Alexa, turn off the TV” but this stopped working with my 2019 Samsung.

I am not sure if it was an Alexa or a Samsung update that changed it.

But I now have to say “Alexa, Turn off the Living Room TV”

“Living Room” is the room that the TV is in as far as Alexa groups are concerned.

So it might be worth looking at the groups in Alexa App and seeing if you can specify the Alexa group when asking to turn off the TV via a voice command

@GuitarSuperstar & @BMF I am able to control the TV on/off using Arc’s Alexa after unplugging them both for few mins.

However the sound I still seem to have to select Sonos Arc from the Apple TV 4K HDR to connect wirelessly. 

I have the Apple TV 4K HDR connected to my 2016 Samsung TV, then via Sonos ARC HDMI fro Samsung TV (HDMI Arc port).

What do you guys have in your settings or how did you configure?

Thanks

I don’t have the latest gen 2 4K Apple TV, but do have the previous gen 4K.

One thing that I have had to do on the AppleTV 4K in the past, on a 2016 4K Panasonic is to force the audio to Dolby Digital 5.1 instead of automatic in the settings of the AppleTV.

On the AppleTV 4K

Settings>Video and Audio>Audio Format>Change Format>Off

Change to “Dolby Digital 5.1”

I don’t need to do this on my 2019 Samsung, but the 2016 Panasonic needed it to be forced to DD5.1

that is the only thing I have had to change on AppleTV 4K to get It to work with a Sonos Soundbar

@BMF I don't have that option on my 2016 samsung tv :)

@DJcraze no, no ….. the option is on the AppleTV 

Sorry, reworded to highlight the settings change is on the AppleTV and not on the TV

@BMF thank you! should the audio output be Sonos arc?

No, just try setting the format to be Dolby Digital 5.1

not sure I have ever seen an option for Arc on the Apple TV

wait, are you trying to use AirPlay from the AppleTV to the Arc?

The Change Format setting on the Apple TV should actually be set to ON so you can change the Audio Format to Dolby Digital 5.1.

And keep Audio Output set to TV Speakers.

@BMF ok will just change the format to Dolby Digital 5.1

I don't want to Airplay to Sonos Arc, without choosing/selecting what speakers the audio needs to come i.e. even though it says TV speakers I wanted the audio to come from Sonos Arc.

Thats how it used to be with the previous Apple TV 4K.

@GuitarSuperstar sure will do.

@DJcraze great, just wanted to make sure you were not trying AirPlay 

if I changed the audio format on Apple TV to Dolby Digital 5.1 and the audio output to TV speakers, will the audio automatically come from the Sonos Arc.

Should I be able to control the audio from Apple TV remote?

It should do, yes.

all you are doing is sending the sound to the TV in 5.1 Dolby without AppleTV trying to decide what is best and to use the tv for sound.

the tv in turn should ignore the tv speakers part and use the Arc for sound 

@BMF & @GuitarSuperstar Thank you! with the above settings change everything is working great now! 

Back to like it used to work before :)