Try turning the microphone off on one of the Eras (or both if you don’t use voice control) - you only need a mic on one speaker in any bonded or grouped setup. I’m clutching at straws to a degree but anything’s worth a try..!

I tried completely disconnecting microphone on all devices: the Arc Ultra and the two Era 100s in the home theater setup. It didn’t help. Then I decided to do a full reset of the TV. I unplugged everything connected to the TV, did the reset, and reconnected everything from scratch. The clicking sound is still there.

It’s been eight months, and I’m still dealing with the same issue. I just got off the phone with Sonos support about the original case, and was told Engineering is still working on it. I’ve reset the system multiple times with no change. The microphones are off on the Arc Ultra and both Era 300s. I’ve also swapped out HDMI cables, changed settings, and even reset my Apple TV—still no luck.

Sorry to hear about your dilemma. If your Arc Ultra is still in warranty (or not) I’d appeal for a replacement unit by contacting Sonos Customer Service. 

Just a quick update regarding the Sonos Arc Ultra issue—

I requested a replacement unit and have been using it for the past 10 days. I did hear the pop once about two hours into playback across various types of content, and then again the following day while streaming. However, I haven’t heard the pop again over the last 8 days.

Based on this experience, I highly recommend that anyone still dealing with this issue request a replacement. Doing so will also reset your warranty for another year, which is important in case the issue remains unresolved for another year.

Glad your issue appears to be resolved. FYI, what you experienced seems to be a semi-common occurrence in SOME wireless speaker environments. The links below speak to what you were experiencing. Although it has no bearing or changes your outcome/resolution.  

• Random popping or crackling sound from wireless subwoofer and/or rear speakers
• I solved why my wireless bass module was popping/crackling : r/bose

After a recent update to the Arc Ultra in early August 2025, I am now experiencing some light crackling sound. It's not 100% of the time but every now and then and gets resolved if I restart the Apple TV. I’ve had the Ultra for months now and never had any issues but after the update, it started happening. Even the wife noticed it so I’m not imaging it, haha. 

​@iamafanofyourproducts 

Posting here may deflect suggestions away from your post which you have now duplicated by posting the same information here.  I’m just saying….

The problem has not yet been resolved.
Replacing the Arc Ultra did not help me or others.

New firmware is needed, and this has been confirmed here…

Arc Ultra: Popping Sound Across All Content Types | Sonos Community