FWIW, it's not just this TV. Samsung seemingly can't figure out ARC to save its life. ARC is straight garbage on both the 2019 Frame I have and the Q90T I had before returning it. Both were going into different Samsung soundbars and I never have/had a stable connection for either - constant dropouts, increases to volume on the screen not actually being reflected in the volume level, etc. I've given up now and just always connect to the soundbar through WiFi.ARC/eARC is definitely broken on this TV. This was one of the first issues I noticed with the QN90A. I get handshake dropouts and gotten the weird noise once, but the latter was only after the latest update.