Arc TV sound cuts in and out.

I replaced an LG SN8YG sound bar with an Arc. I had the same problem with the LG sound bar…..UNLESS I ran the HDMI between the Apple TV and the sound bar, and then from the sound bar to the TV, 

Of course, that’s not an option with the Arc. So I’m left with the following via process of elimination: problem is either with the AppleTV or with the LG TV eARC.

I guess I could plug in another streaming device and see if that works. It’s unfortunate that every other device is missing an app (Apple TV for google, HBO max for amazon)...ugh....

I had a beam before getting an arc and there were no problems at all. But with the arc using hdmi ARC i have small problems and huge problems with eARC.

Im pretty sure its either a hardware or software issue with Sonos arc. And if its hardware then they better realize it fast so all the people who bought expensive equipment can get it exchanged and enjoy the full experience.

I am not sure if it’s eARC that’s the problem or the Apple TV. 

It is NOT the Sonos. As I said, I had this exact same issue with the LG sound bar. The only workaround was to put the Apple TV into the sound bar (it has an HDMI in and out) 

The Arc doesn’t have an HDMI in and HDMI out, so that’s not going to work. 

I have not reached out to LG support...the TV I have had Atmos speakers built in (such as they are)….and if I’m just using the built ins, I don’t have the problem. So it’s either the signal from the LG TV to the Arc or the Apple TV signal to the LG.

(Just to be sure, my Apple TV outputs audio to the TV -- nothing else -- over HDMI, and then there’s the eARC connected between the Arc and the TV. If anyone has any different settings with success I’m all ears.

I had the problem before getting an ATV and just using the native apps. And i had a beam connected to the same tv for 5 months without any problem at all. But after getting the arc i had problems with both “normal” arc and eARC with the later being most anoying because i lose audio completly.

ATV 4K has not changed anything other than i have to use eARC now to get LPCM and therefore i lose audio reguarly.

I understand your reasoning to determine that it is not the Sonos Arc soundbar's fault in your case. At the same time, there are numerous people having different TVs with the same problem using Sonos Arc soundbar. 

That leads me to the following question: Could it be a more profound issue with eARC specs affecting multiple manufacturers?

Sonos & Samsung has solved the issue. I recently purchased the Samsung TU7000 4K TV (with eARC) along with the Sonos Arc, 2 One SL’s and Sub. I also purchased the Apple TV4K for Dolby Atmos and Dolby Vision. I tried it out, and updated both the Sonos and Samsung, and they do not have a problem with arc cutting in and out from TV. I also have Dolby Atmos when I watch Disney+ through my ATV 4K. Just wanted to keep anyone looking to purchase this same setup - yes, it works.

This is really upsetting that there is not a way to find the cause. It’s so easy for each company to say it’s the other company’s fault. I have pretty much had this cutting in and out issue after watching something in Atmos on Apple TV 4K, then watching pretty much anything else, on Apple TV, on My TiVo Edge, etc. The way I’ve come to resolve for the tome being is unplugging the TV and waiting a bit to watch something else. Everything is up to date, my 65CX LG tv, my Apple TV 4K, my Sonos Arc, as well as my TiVo Edge. Someone needs to do something!!!

Yep add me to the list. After the Arc update today to 12.2 I’m getting the constant drop outs with my LG CX after swapping from Atmos to non Atmos content. The awful experience continues.

This issue has finally been resolved for me today with the arc update. (Samsung frame tv)
4 months was way too long for a resolution. 

That sounds like the Arc was perhaps receiving the recent firmware update - so I assume you have automatic updates enabled in the Sonos App. You may need to update your Sonos App software too, if you perhaps haven’t done that already?