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oetienne
Contributor I
April 12, 2026
Answered

Volume is changing randomly (most of time reducing)

Hello,
I have trouble with my sonos system in my restaurant.
The volume is changing by its own ! most of time reducing, i have same issue with sonos radio and spotify.
I have 3 era 300, 2 era 100 and one sonos one, connected on unifi wifi system (no wire connection).
I have contact the support many times bu no solution.
Have you any idea ?
Regards

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Stanley_4
Stanley_4Answer
Grand Maestro
April 12, 2026

Try it again, note the Diag number.

Then call, if you get nothing from the person on the call ask to open a support ticket and escalate the issue. 

I don't recall a single instance of support not being able to identify the issue's source if it was caught by the diagnostic process.

16 replies

Senior Virtuoso
April 12, 2026

Who else has access to your network? And, Spotify users are a frequent problem: they stay logged on until something disconnects them. 
 

Generate a diagnostics report within a few minutes of an occurrence and they at least should be able to tell you where the “volume down” command was generated. 

Mr. T
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

oetienne
oetienneAuthor
Contributor I
April 12, 2026

Who else has access to your network? And, Spotify users are a frequent problem: they stay logged on until something disconnects them. 
 

Generate a diagnostics report within a few minutes of an occurrence and they at least should be able to tell you where the “volume down” command was generated. 

Thank you for your reply, nobody else access my network, got same issue with spotify and sonos radio !

I have generated already many diag but no solution from sonos support team

oetienne
oetienneAuthor
Contributor I
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

All sonos is reducing, but the level in application do not move ! just the level from the system

Senior Virtuoso
April 12, 2026

Who else has access to your network? And, Spotify users are a frequent problem: they stay logged on until something disconnects them. 
 

Generate a diagnostics report within a few minutes of an occurrence and they at least should be able to tell you where the “volume down” command was generated. 

Thank you for your reply, nobody else access my network, got same issue with spotify and sonos radio !

I have generated already many diag but no solution from sonos support team

What did they say was causing the volume change? The diagnostic report should tell them that. 

Mr. T
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

All sonos is reducing, but the level in application do not move ! just the level from the system

You have communication issues on your network if the volume slider in the app is not matching the speaker output.

oetienne
oetienneAuthor
Contributor I
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

All sonos is reducing, but the level in application do not move ! just the level from the system

You have communication issues on your network if the volume slider in the app is not matching the speaker output.

It sound logical, the network system is unifi, do you have any idea what can i check on the network ?

oetienne
oetienneAuthor
Contributor I
April 12, 2026

Who else has access to your network? And, Spotify users are a frequent problem: they stay logged on until something disconnects them. 
 

Generate a diagnostics report within a few minutes of an occurrence and they at least should be able to tell you where the “volume down” command was generated. 

Thank you for your reply, nobody else access my network, got same issue with spotify and sonos radio !

I have generated already many diag but no solution from sonos support team

What did they say was causing the volume change? The diagnostic report should tell them that. 

With my diagnostic they found nothing.

Mr. T
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

All sonos is reducing, but the level in application do not move ! just the level from the system

You have communication issues on your network if the volume slider in the app is not matching the speaker output.

It sound logical, the network system is unifi, do you have any idea what can i check on the network ?

 

You can start here:

 

oetienne
oetienneAuthor
Contributor I
April 12, 2026

Is the volume reducing to a specific volume number? ie. 15. If so then it implies safety protection on one of the speakers is kicking in, if all are grouped when this occurs. This can also happen if the Era 300 speakers are not level.

All sonos is reducing, but the level in application do not move ! just the level from the system

You have communication issues on your network if the volume slider in the app is not matching the speaker output.

It sound logical, the network system is unifi, do you have any idea what can i check on the network ?

 

You can start here:

 

Thank you very much, I have follow the best pratice, so i change only in my network the  IGMP Snooping to Enabled

All the rest was allready compliant,

Let’s see