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Samsung 8K Television Antenna audio stops in Arc soundbar. DirectTV and Apple TV Sound never quits.

Talented home owner and installer unplug electricity and Antenna audio works again. Looking for help.

Turn off HDMI-CEC control on the connected TV peripherals (Apple TV etc.) or use CEC-Less adapter between the TV and connected device. Power off all just for a few minutes (not standby) and then see if that resolves the issue. HDMI auto-switching is likely your issue, particularly as it’s a Samsung TV.