May I have your full model code?
We just bought the qn75q80rafxza qled on Monday. I have disabled the Bixby thing. And yet, if you are having a conversation anywhere within 5-8 feet of the television, it starts typing your words across the bottom of the screen. AND THIS IS WHEN THE TELEVISION IS TURNED OFF!! I have nothing to hide, but it really makes me angry that my television is "listening" to everything that is said 24/7.
Have you attempted unplugging the unit for about 5 minutes then replugging it directly into a wall socket?
Try turning off "Voice wake-up" by doing the following:
Press Voice button on remote -> Select Explore Now -> Select Settings icon on the top right corner -> Voice wake-up -> Select OFF