Apple TV automatically resets volume
I have an Apple TV 4K with a new Siri remote. A few days ago it suddenly started automatically lowering the volume to just where the top of the speakers are on the volume bar icon. I've made sure that the output is still set to my HomePods and that Reduce Loud Sounds is off.
I've tried turning off the Siri as I've read that might help, but nothing makes any difference.
Any ideas?
Apple TV 4K, tvOS 15