Good luck all,
I had the Q80R soundbar and this same issue happened to me ALL the time. I eventually returned it for a replacement and it exhibited the exact same behavior.
I had a samsung tech come to my house to fix the issue and even he couldn't figure it out. He suggested I exchange the replacement unit for a second replacement unit.
Their soundbars sound great but man oh man do they have a bevy of technical issues.
Issue was never resolved and I switched to SONOS.
I bought a Q80t tv and I am using an old Sony soundbar, sbubwoofer for audio with the Arc connection. TV keeps reverting back to TV speakers. My two samsung plasmas, and one older LED do not have this problem. My best solution for now is to turn on the TV first, and then turn on the soundbar. If I do that, then the TV uses the soundbar. If I program my cable remote to turn both on at the sane time, then it defaults to the TV speakers. I also turned down the volume on the TV speakers to 0, just in case the TV and soundbar were both activated, in order to avoid the echo effect of having both on at the same time.
So far this has worked. Its just one extra step to take when turning on the set. Its easier than having to go into settings and changing the speaker selection.
However, I think this is something Samsung should fix. Its a bug.
I have a new 85" Q90T with a Dennon 4K Receiver Using ARC and I have the same problem.
Unit will boot using the receiver but if you use the home button or start an APP ( when they don't fail) it will revert to the TV speakers. Only way to go back the the reciever is to reboot the TV.
There needs to be an option to turn off the Internal speakers and force an arc connection. ( or remember) . Hands down this is the worst TV I have ever owned . and they call it a Flagship....
Just installed a sound bar on each of my Samsungs (different models and years). Both TVs though randomly revert to TV speakers about half the time instead of using the ARC HDMI connection. Came here to see if I was alone. It seems I am not. Very infuriating
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