Thanks for posting here in the Community.
For us to isolate your audio issue, it would be very helpful if you could answer the following questions.
-Do you receive any error code or message? If yes, please let us know.
-Does the issue only occur on a specific channel or across other channels installed on your device?
-Are you using an A/V receiver or soundbar with your TV/Roku player setup? If so, what is the make/model of that unit?
-In Settings > Audio > Audio mode, what setting do you have selected? Does the same issue occur if you change the setting to Stereo, etc.?
Moreover, if the issue only happens on one channel, removing the channel then adding it back in may help. You can visit this Support article for detailed instructions on how to do it: How do I resolve channel playback issues?