14.15 update is out.. let me know what it does. dont want any more disappointments

In 11 years of using Sonos I am yet to experience any problems as a result of a bug. I shall continue to update without losing a second's sleep.

The bug fixes referred to in every update, as @melvimbe says, probably deal with combinations of circumstances that are extremely rare. Which is why they get fixed without any of us noticing they exist.

(Luckily, I have only Android devices so cannot Trueplay. So, not knowing what I am missing, my Arc HT system sounds to me exactly how it has done since I bought it, I.e. brilliant. )

I said I would “fall back three or four releases behind the current release”. There’s no way to apply a specific update that I know of. I’m not never going to update but updating on a minor release seems safer to me. But maybe I’m wrong. 🤷‍♀️
 
I hope that most people keep auto updating so  I’ll know when I’m good to update  😀

I was of the same opinion as you as far as updates go. I’m glad you still trust them, I’ll let you go first. 

Many thanks to those who responded to my post!  I have just managed to resolve the issue after online chat with Samsung and factory reset of my TV.

The issue seems to have been software fault with the HDMI port(s).

Perhaps it was a coincidence that this started immediately after updating to 14.15, as others have suggested. 

After remote support rebooted the HDMI software I performed a factory reset.  During the setup phase the TV could detect that something was plugged into the eARC HDMI but kept providing an error message because it thought there was no power to the Arc.  (My PS5 was detected without issue.)

During this phase I was able to use the Sonos app to setup the TV, which I was unable to do before as the Arc could not detect the TV.  But the TV could not detect the Arc as a sound receiver.

Once setup was complete the Arc appeared in the list of sources and HDMI appeared as an option for sound output again.  Tested Atmos content from streaming apps and it was fine, so happy days.

If anyone else is having issues with a 2020 QLED and Sonos Arc I suggest following these steps.  The factory reset might be enough on its own, but if this does not work then contact Samsung and ask to have the HDMI ports remotely reset.