These things are just little special purpose computers. Like their big brothers sometimes you need to clear things out by restarting them.
Restart via Settings > System > System restart (Or for Roku TV: Settings > System > Power > System restart)
If a restart doesn't do it, try pulling the power plug to the device for a minute or so then plugging it back in
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking " Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X