I have Roku Ultra connected to router directly with Ethernet connection. Router is Orbi base station. all other devices are connected to it wirelessly. Roku is connected HDMI to Vizio TV. TV and Sonos sound bar connected via HDMI ARC. When I first hooked up the Roku Ultra a year ago private listening worked fine. Now it no longer works, through the headphones with the remote control or through the app on iPhone. Any idea what to do to get private listening working again?