Roku TV Model LC-55LBU591U Rev D
My sound bar and tv has been working perfectly.
My roku remote turned on the tv and sound bar.
All of a sudden after months of working great the remote stopped controlling the sound bar.
The sound bar functions perfectly with its native remote
Try refreshing the cec devices in the tv settings. Roku only controls the tv, its upto the tv to control the soundbar. It won't send remote commands over the optical cable, only hdmi cable. Do you have hdmi cable connected between the soundbar and the tv? Without one you will have to use the soundbar remote and or universal remote to control all three.