I have this strange issues, that my Arc Ultra does not accept the Vol down command from my IR remote. It just won’t react.
If I press Vol up, it reacts immediately (IR signal indicator and actually increasing the volume).
After that, the Vol down button gets recognized, too.
Almost as if the Arc Ultra’s IR receiver component goes in some kind of sleep mode and only gets woken up by the press of Vol Up.
Usually, unless you’re using an optical cable, the Sonos Arc Ultra should be receiving volume commands through HDMI-ARC with the remote communicating directly to the TV, and not via IR through the remote. Do you have your Arc Ultra connected via optical to your TV? If so, I’d go through a reset-up procedure in the Sonos controller.
If you have your Arc Ultra connected via ARC, then there might be an issue with the ARC computer in the TV. I’d reboot the TV by unplugging it from the wall for two minutes, then plug it back in. I’d also check for updates to the OS of the TV, just in case.
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