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Issues with the sound sync

  • December 1, 2025
  • 2 replies
  • 21 views
A

I have issues with the sound sync on a certain channel (TV4) in Sweden when I have my Sonos system connected to my TV (Samsung S90D). 
 

The problem is quite random and will usually appear after the commercial break. If I change channel and go back again the problem will disappear. 
 

I have tried to use both Ethernet and WiFi connected to the Arc Ultra with a good connection but it is the same both ways. If I disconnect the HDMI cable from the sound system everything seems to be okay again. I have changed the sync settings in the software but the problem will remain. 
 

Any idea what can cause this sync issue?
 


 


 

 

 

M

2 replies

Airgetlam
  • Airgetlam
  • December 1, 2025

That’s certainly odd. It suggests that the TV isn’t handling format changes properly, and consequently munging the feed to Sonos, which merely plays what it is handed.

I would try several things. First, reboot the TV, and all devices that are feeding it via HDMI. I’d also reboot the Sonos. Unplug them all from the wall for two minutes, then plug them back in.

Then I’d check each device for updates to their respective OS. It’s possible this issue is ‘fixed’ by either the reload of the device, or a new OS completely.

However, if it continues to randomly occur, the next time it happens, I would recommend that you submit a system diagnostic within 10 minutes, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, their lawyers get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Bruce
A
M
A
  • Aqua_HeaD
  • Author
  • Contributor I
  • December 1, 2025

That’s certainly odd. It suggests that the TV isn’t handling format changes properly, and consequently munging the feed to Sonos, which merely plays what it is handed.

I would try several things. First, reboot the TV, and all devices that are feeding it via HDMI. I’d also reboot the Sonos. Unplug them all from the wall for two minutes, then plug them back in.

Then I’d check each device for updates to their respective OS. It’s possible this issue is ‘fixed’ by either the reload of the device, or a new OS completely.

However, if it continues to randomly occur, the next time it happens, I would recommend that you submit a system diagnostic within 10 minutes, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, their lawyers get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Thanks for the information. I have tried all your suggestions already without any progress and all my devices are up to date. I will try the system diagnostic process next time. 

Airgetlam
M
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