I have a Vizio with similar issues. About every third time I turn it on I get the black screen. The on ly thing that fixes it is to unplug the tv wait 10 seconds and plug the TV back in. PITA. It is totally rokus fault.
Thanks for the post.
Can you please provide more information about the issue you are experiencing? Are you using a Roku device or a Roku TV? What are the steps to reproduce the issue?
With more detailed information, we will be able to assist you further.