@Harvest Thanks for the note here. Could you please provide more information about the issue you are seeing, as well as your home setup? Are you using an A/V receiver? If yes, what settings are currently selected in Settings>Audio>S/PDIF and ARC? During playback of an OTA channel, press the * key on your remote to open the lefthand settings menu—do you have any Volume Modes enabled? Does disabling this resolve any of the issues?
With more information, we can keep looking into this to see what else we can recommend.
During playback of a channel, press the *key on your remote. A menu should open on the lefthand side of the TV. Locate 'Volume Mode' in the settings list. Is anything enabled here? If so, try changing the setting to 'Disabled' and see if this resolves the issue.
@qstcottage That's great to hear. Were you also experiencing this issue when watching OTA antenna channels, or was this occurring while watching a streaming channel? Please feel free to drop me a private message with your Roku TV's serial number and more details. I'd be happy to help pass your report along to my team to take a closer look.