Having the exact same issue. I’ve had a TCL Roku TV for a couple of years and never been able to fix it, no matter what I try. Outputting stereo audio isn’t an option, as I have a Vizio surround sound system I want to use. TCL and Roku don’t care about this at all and keep releasing TVs with the exact same issue. If I had known this, I would have returned my TV, but I mistakenly thought they’d fix it with a software update.