Check your mic settings..disable blu tooth....having huge issue with new Roku Ultra 4800 and garbled sou d and or video. Sounds like sound comming from underwater. Weird...swapped new hdmi cables but some relief with Bluetooth disabled on TV. Noticed other issue tied to remote use so disabled on remote and internal and both issues abated for 24 plus hours. With my issue not solved on video green flashes had to return new 85x91j Sony tv. New TV has same sound issue when on tubi so still testing with passthrough manual.
