Having the exact same issue with my Series Q70 TV and Q70R soundbar. Something happens overnight, and the TV resets to TV Speakers instead of optical, although the soundbar correctly powers on simultaneously with the TV. Have to manually change the sound output every day... I can do this, no big deal, but I will never be able to exlpain the process to my elderly mom when she comes over to visit. This is very annoying, would be a nearly perfect TV otherwise.
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