Ok, I had leveling off, turned it on and the intermittent volume stuttering went away. Apparently just changing the leveling corrects the issue? A reboot did nothing to help.
Same as everyone else. Finally permanently fixed it by turning off Dolby Digital and/or DTS in the Roku Audio settings. Just choose "stereo," and you should be good to go.
Thank you info fixed my audio noise.
Using Roku ultra, had this problem. Audio hiccup every 15-30 seconds. One poster suggested to simply reboot the Roku through system menu / restart. Uh…duh. It worked. That immediately and completely solved. Thanks.