I just got a TCL TV and it has an optical port and so does my Vizio soundbar. When I connect with an optical cable, the audio cuts in and out every few seconds for like half a second. I tried several audio settings, but no luck. The video does not skip so I assume it's not network related. Any help please?
What version of the Roku OS are you on? I have a TCL TV and Vizio soundbar, but I am connected via HDMI on my soundbar to TV without any issues. You may want to review the support thread link below that discusses Intermittent Audio issues.Intermittent Audio after 8.1 Update