Arc microphone constantly turns off and off by itself

The only reason that I can think of that could cause this is if the Alexa  integration is losing connectivity.  It’s a long shot but have a look at my post here: 

the problem is in the lg tv’s eARC 

when the sonos arc is disconnected from LG eARC, the  microphone on/off problem goes away.

the tv’s internal alexa is turned off.   the “HI LG” tv feature is turned on.

From purely a Sonos perspective, the only way that the mic can turn off is if the Alexa integration is broken at some point or someone presses the Mic button.  What model TV do you have?

Hi

What @UKMedia has said is a possibility. First verify that the Sonos skill is active in the Alexa app and up-to-date. If all is good in the Alexa app try deleting the Alexa voice assistant from the affected speaker and re-adding it. If that doesn’t correct the issue here are two more options:

Option 1

• Make sure your device software is up-to-date
• Remove the Alexa voice assistant from the affected speaker (if other speakers are having the same issue do the same for them)
• Sign out of the Alexa app and delete it
• Re-add the Alexa app to your device and sign-in
• Make sure your preferred skills in the Alexa app are active (especially Sonos) 
• Re-add the Alexa voce assistant to the affected speaker(s)
• See if the issue persists 

Option 2

• If the above did not resolve the issue 
• Submit a diagnostics within 10 minutes of the occurrence (if possible) or upon discovery
• Post the reference ID number in this thread
• Call Sonos Tech Support

was on phone w/ sonos tech support for 1.5 hours.

they ran a lot of diagnostics w/ no success 

they r shipping me a replacement 

hope that works…

‘’THX ALL for replies!

I have the Sonos voice assistant and the mic constantly turns on and off at random. I had a replacement sent with the same results. Does it whether i am using the tv or just playing music. What a hunk of junk.

sonos has run all these diagnostics to no avail.

they even sent me a replacement arc and the random off/on issue still persists

they claim that this arc off/on issue is new to their techs.  i found 3 year old reddit discussions (without solutions) for the same arc off/on issue

sonos can’t explain to me why i did not have this off/on problem with my beam (gen 1)

guess i will just go back to the beam because no other sound bar is compatible w my sonos system.

Leaving the speaker connected to the TV’s HDMI-ARC/eARC port, what happens if you simply move the Sonos Arc further away from the TV and create a bit more distance between the two? Does that solve the mic on/off issue?

placed the arc and power source 12 feet from the tv (no hdmi arc connection ) and still experienced the off on (muting) problem.  So, the distance from arc to tv is not the cause.

hooked arc up to a different tv, different brand, in a different room.  same issue

I can only suggest you perhaps get back in touch with Sonos Support, with a system diagnostic report/reference after reproducing the issue and see if they can resolve the matter.