I occasionally get a loud buzzing over the audio from Beam connected with HDMI

Hi Aaron, I'm convinced it's a problem with the recent update of the app to S2.  Everyone who's reported the problem seems to think that to. Sonus unfortunately seem to have given up on this thread as they've not posted in a while.

Hi all. There’s a update today on the sonos app. Hopefully this might fix the issue. 
 

Aaron

I was unfortunately on the same boat as everyone else. I have a Samsung smart tv and the buzzing appeared fairly recently.  I didn’t change any settings at all and I have done everything that was suggested in this thread to no avail and whatever recent updates happened they didn’t help at all.  Unplugged the optical cable and blew air into it to get any dust out.  After all the resetting I looked at power and the plug was partially out of the power socket! I made sure it was plugged in tightly and the buzzing went away. Bad grounding! I hope my bone headedness fixes the problem for some of you  

After not experiencing this for a while I though that problem has been fixed in latest sofware updates, but I just experienced what I believe is a new form of same issue:

turned on TV and sound seamed to be odd (no buzzing though). After I came closer to Beam I understood that central channel (speach) is coming not from the central speakers but from left speaker instead. It was hard to determine what exactly was going on with center and right speakers, but seamed that there is some sound coming out - I’m guessing channels were swapped and center speakers were playing left or right channel audio.

Powercycle set everything back to normal.

I'm having exactly the same problem with a Samsung TV and it started a few months ago. First time I noticed the static background noise was via the TV's Facebook app. Once it starts, the tone of the static noise changes when I start a different video or I stop it. Same happens if I open a different TV app. The problem solves only after a power cycle the Sonos Beam. The problem is happening roughly once a week. Please, do something Sonos. Look how many people in this thread is complaining about the exact same problem.

I have the exact same issue as OP: Samsung Smart TV hooked up to beam via HDMI (ARC) and only happens when I’m on YouTube. If I switch to other apps like Netflix or Spotify I don’t get the buzzing. This has been going on since the beginning of the year for me, but I notice it happens only while watching a YouTube video.

Dear Sonos support,

just wanted to let you know this issue is still unresolved!

I'm forced to powercycle by Beam every other day. This is NOT normal!

Creating support cases gets us nowhere as many have stated in thi thread.

Please can we at least get an acknowledgement form Sonos side that you are aware of this problem? Communication regarding this has been very poor and although product is good othervise I would never suggest Sonos to anyone due to this attitude!

I just purchased the Sonos Beam. 2 days later watching internet TV I get loud buzzing from right speaker on beam- no resolution available.  £360 for a speaker- I expected a little better than this Sonos. Terribly disappointed, returning for a full refund. I will never recommend Sonos to anybody. 

I will echo what everyone else has been reporting on this thread. Playbar plugged to Samsung TV via optical. No problem until maybe 3 weeks ago. Now, several times a week, the playbar emits a buzzing sound, only when outputting from the TV. Playing music wirelessly from the app never triggers the buzzing noise. Sometimes, I’m able to get rid of the buzzing when switching the TV audio from dolby surround to PCM, but some other times, this does not resolve the problem. Unplugging the playbar is the only remedy, but it is only a temporary fix since the buzzing starts again a few hours or a few days later. I tried to switch the optical cable, recheked all my connections, … As everyone reported here, this has to be a firmware issue. Please Sonos, solve this! I don’t want to end up with a giant $500 paperweight.

I have exact same issue however it’s only when I play channel 7HD...everyone other channel including other channel 7 variants (7TWO, 7MATE) all play perfectly.  When I play 7HD through Sony Bravia TV speakers it plays fine. However 7HD through the Sonos Playbar will play a loud humming sound...very bizarre and annoying.

I have taken the advice of other people on this thread and the hard power reset has fixed the issue. (For now)