Welcome and thank you for posting here at the Roku Community!
We understand that you are having audio issues with your Roku Premiere streaming device and we're here to provide assistance.
For troubleshooting purposes, have you tried to unplug and plug your Roku streaming device? If so, and the issue issue is still persistent, kindly provide us the following details so that we can pass this along to our appropriate Roku team for further investigation:
Serial number of your Roku Premiere, device ID, and software OS/version (these can all be found in Settings > System > About).
Does this issue occur on a specific channel? If so, what channel and what version/build is the channel (this can be found by selecting the channel on the Home screen and pressing the * button)
Tracker ID when this issue occurs (press the Home button 5 times, followed by the Back button 5 times and provide us with this ID)
We look forward for your response and we'd be more than willing to further assist you with this.