My 55" Q80T does the same thing. It appears to be an issue with eARC. Audio drops frequently with content is Atmos. I've used multiple HDMI's. I have a Sony DH790 and AppleTV 4K. I had no issues with my LG and if I disable Atmos from the TV or run the feed through the receiver first I don't have the issue - however then I get a audio/video sync issue which is more annoying. I would love Samsung to fix it.
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