Over the last few days when watching Disney plus, the screensaver pops up every 30 minutes or so. What happens is the screen goes black and the Roku Insignia logo floats across the screen ( I have a Roku Insignia T.V.).
I have tried disabling power save mode, tweaking the screen settings, & going into the app settings on Disney plus, nothing works. This only happens on Disney plus, nothing else.
Your screensaver may be enabled and set to 30 minutes (Settings/Theme/Screensaver wait time=disable secreensaver)
Otherwise, check for updates (Settings/System/System updates/Check now) and Restart (Settings/System/Power/System restart/Restart).