I have the same issue. Like other commenters, I reset the remote. It worked for a minute and then stopped again. I have an older-generation Apple tv (no idea which one, but its about 4 years old) and a new (less than 3 months old) Gen 2 Siri remote.
In other words, I spent $60 on a new Siri remote and the freaking thing does not even control the TV volume anymore, so I find myself having to get up and change the volume on the TV manually. You had one job $60 Apple remote... one job!!
WescottFive
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