Hi all, FIXED the problem for meant least. I have a 75' Q7F and running a amp with home cinema. All of a sudden overnight TV kept resorting to tv speakers. First of all I blamed my Wife as you do! Nope Samsung definitely has a bug. Ok, I tried everything! What worked for me was disconnecting the power from the smart up! Powered back up, turned it off and back on the external speakers as it should be. Hope this helps everyone.
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