We're seeing repeated posts citing the similar problems. Seems to be tied to an update to Roku operating software version 10.5. Roku menu path Settings > System > System update will show you your current version as well as when it was installed. While you're there you can click Check now to check for and install any recent updates.
Some people with this problem have reported success by unplugging both their tv and Roku for 30 minutes then plugging them both back in. I don't know if you really need to wait 30 minutes, but that's what has been reported.
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.
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