Same here, since the update a couple of days ago both of my Sonos One’s play Alexa way too loud relative to normal levels.  Even with music level at zero Alexa will blast out at a high level.

Same goes if I do ‘Hey Sonos’.  

Not found a fix yet.

Thanks for the reply, andyinleeds. It was helpful.

I called the help desk at sonos before posting, but the following two answers were given, so I asked the question here just in case. It looks like I'll have to restrict usage for a while and see what happens.

　　(1) No firmware updates have been performed recently.
　　(2) I think the WIFI settings at home are affecting the problem.

If firmware is the cause, Sonos should definitely look back at the May incident and do a thorough release inspection.
I wake up every morning with the alexa setting for news and music, but the news was loud and disturbed my wife and children.

It is sad.

Spent a good while on the phone and I’ve supplied a video/audio for engineering with the relative levels of the Alexa/’Hey Sonos’ voice when main audio is both at 30 (fine) and at 1 (too loud), so I’ll see how far I get.

Same Problem with sonos One

Sonos OS: S2
Version : 16.4.4 (numéro 81158210)
Version matérielle : 1.21.1.8-2.1

No improvement after factory reset

maybe one day we'll be able to set response volume level  (Sonos Voice Control )

Same here in Austria with Sonos one. Talked an hour with support and tried everything. Removed Alexa, removed Sonos skill in Alexa app, disabled Sonos speakers in Alexa app, removed volume Limit, restartet Modem and Router, resettet Sonos one, unplugged all Sonos products from power, changed different settings in alexa app, tried Sonos voice control and Google Assistent. Didn't changed anything. With this loudnes, the voice assistents are useless. This is ridiculous...

Ditto: since app update to 80.11.33 which updated speakers to 81.1-58210 Alexa screams at me. My "good morning" routine is essentially useless because the volume is WAY too loud for my bedroom. WTF?

I have same issue with Sonos Beam Gen 1.  Started with their software update on 31 October.  Have done a complete factory reset but no change to issue.

Dear SONOS Support

We would like to thank you for your continued support.

We would appreciate it if you could provide us with specific information regarding the above situation and whether you are taking any action within your company.

Same issue here. Let’s hope Sonos fixes this asap

Same problem here. 

Same issue with my Beam since a few days… :(

I have the same issues with alexa‘s volume not bound to the general volume. Very annoying. 

Same issue here with beam and play 1

Same issue here with Sonos One. Alexa has been loud for about two weeks. I can't control her volume along with the music volume. C’mon Sonos. Sort it out.