My Roku remotes don’t allow forwarding or going back about a half hour into a show on Xfinity as well as YouTube. If I go back to the home page and then return to Xfinity and then my show, the back and forwarding buttons work fine. This has also happened with the remotes for two different TVs. The tvs are usind current Roku sticks. The remotes are RC-GZ1.
I’ve reset the Roku sticks by turning them off in settings.