Arc and LG OLED TV sounds cuts in and out

I have Apple TV 4HD, Firestick 4K, an old PS3 and a Virgin Media Tivo V6 cable TV box - so I use a HDMI switch too, but no sound drop/sync issues at all with the C9 - I’m not using any special cables, just those that came with the devices, but all my devices are wired to an unmanaged ethernet switch back to the router. Not that I think wiring makes a difference, as I’ve tried the Apple TV on WiFi in the past (and that really makes the connection quicker) as the ethernet port on the ATV4 HD is only 100Mbits/s, but I prefer the stability of a wired connection.

The Sonos Arc however is running on my WiFi (WM:1), as are both the surrounds and Sub (WM: 2)

I guess you’re lucky then😉 

Have you tried setting up the HDMI handshakes again with your devices by powering everything off completely (not standby) for a minute or so? Maybe consider changing your HDMI cables too if the problem persists. Faulty HDMI cables are certainly not unheard of.

Tried everything and nothing works. 
 

Are you working on the issue Sonos?

Do you get drop outs if you use internal apps like Netflix? If so, can you try internal apps with the Apple device unplugged, or is it purely happening only with the apple device?

Yes i did. Before i got my ATV 4k i had drop out when switching from Netflix (or other apps) and to the tv tuner. Now i mostly happens when switching source (ATV 4k to tv tuner). But it also happen when i switch channels and i guess its related to the signal. If i switch from a channel with 5.1 to a channel with stereo i’ll get audio drops.

But can you watch say an entire film without any drops?

So if you don't switch inputs and just watch something, will the entire thing play with no drop outs ?

Can you jump on the network matrix on the link below. Change Sonos IP for whatever IP your arc is using. 

Change some inputs and see if it goes red or anything looks problematic. 

​​​http://Sonos IP:1400/support/review

It only happens when i switch source. 
 

I cant access the link and i have no idea about network matrix and what it means. Everything is connected with ethernet by the way.

If you check “About My System” from within the Sonos app, you can get the IP address for your Arc.  If it was “000.000.0.000”, for instance, you would enter the following into the address bar of your browser:

000.000.0.000:1400/support/review

That address will take you to some links for each Sonos unit you have and there is also a “Network Matrix” link that will show the status of all of your units.  Red areas in the matrix indicate problem areas due to interference, etc.

I am not sure how relevant this is for ethernet only setups but just adding some clarification as to what it is...