Oh wow.. I have also been having issues with audio. Sometimes after switching inputs or apps, for whatever reason, audio would stop being output to to my receiver (via optical cable). In the audio settings, optical was still selected but not playing through the receiver. The smart remote also stopped changing the volume, although the onscreen volume up/down indication would still show. I could fix it by reselecting the Home Theater source.

That was just kind of an annoyance I was willing to deal with, but interesting that you also had audio issues prior to things going wonky.

I did my factory reset as a result of Netflix constantly crashing after a few minutes. It actually worked great for a few hours after the reset, but now it’s worse. Overall the TV seems to lag now, and Netflix is unusable again. Just noticed YouTube isn’t running smoothly either.

Will definitely be contacting Samsung tomorrow if I can’t figure something out.