The unexpected shutdown issue continues with new device and tvOS 17.2, so I know is not the OS or the hardware. Also, it is only happening when I have my bluetooth headphones connected to the ATV. I believe I somehow have a software/setting conflict somewhere in my ATV. I suppose it could also be with a setting in my TV, but with headphones connected to my ATV I am really only using my TV for picture. I'll do some more experimenting and report back.
Any ideas out there? While my symptoms seem more specific than others (ie happens while connected to bluetooth headphones), it believe the reasons for the shutdowns should be similar.