why does Arc mic turns on and off on its on regularly?

I’ve also had this issue a few times now in addition to the voice control turning on and off repeatedly while making a ding sound every time.  Tech support did something remotely to “fix” the voice control but as soon as my kids started playing Xbox it started doing it again.  Hasn’t happened with the tv since the fix but the random high pitch sound while muting the tv randomly happened again tonight.  I’ve had this ARC for about 2 weeks with multiple issues.  A bit disappointed with the problems so far and working with tech support is a bit of a nightmare.  Going to try and get this new issue resolved and cross my fingers nothing new crops up.  

I have the same issue (Sonos Arc connected to an LG TV via HDMI eARC, and am using Alexa as my voice assistant).

The microphone goes on and off quite randomly, which makes voice control almost unusable. Disabling touch controls is not an option as I use them often to adjust volume. 

It is probably best to submit a Sonos system diagnostic report from within the Sonos App, note it’s reference and then contact/chat with Sonos Support Staff via this LINK and see what the Staff can perhaps suggest to resolve the matter.

@Nadezhda C.

There‘s a known hardware issue with some Arc devices as mentioned above. If you contact Sonos support as @Ken_Griffiths suggested I would point to this and probably they will prompt a replacement of your Arc. But they have to check this. 
In the meantime you can turn of hardware touch buttons in Sonos app settings to avoid the ping pong on off behavior. 

Same issue here on brand new Arc with Sub (Gen 3) on LG OLED CX TV. We have noticed it only occurs when playing PS5. When watching Roku on a different input of the TV, this problem does not occur at all. I just disabled Touch control (since we only use Roku remote or app on phone to adjust volume) and beeps stopped. Anyone else experience it only when on one particular input of the TV? 

@withonen 

This could be accidentally I think… to be sure if your device is affected of the hardware problem or not, I would call Sonos support to check this. 

As I stated in a thread elsewhere:

Microphone randomly turning on or off on new Sonos Arc (with Google Assistant AND Sonos Voice Control).

Tested with various set-ups and input-sources. Took me 1 phone call with Sonos on Friday 26 January 2024. Monday 29 January 2024 in the morning a brand new Arc was delivered (from Poland to Holland). Tested it and the issue did not manifest. Free shipping for returning the faulty Arc. Good performance Sonos!!! I am very satisfied and happy!

Case closed.

I’ve added a port and turntable to my system (Arc, sub gen3, 2x era300’s) recently and when i play a record the microphone on my Arc keeps turning on and off even after switching it off physically. I’ve had to disable Sonos voice control on the app. 

@Drew12: Same here. Solved! Just contact Sonos. They will replace the Arc. Read above.

I just got the Arc yesterday and the mic is turning on and off on its own.

I am on hold with Sonos. Hopefully it doesn't take too long. Glad there is a forum here.