I am having the same problem. Every few seconds, the TV goes black. I can hear the audio though. It's annoying!! I have noticed it's only when watching cable, not when watching the apps. I have rebooted the system and reset back to factory settings, but still having issues. I contacted technical support and nothing has helped. My other TV's are not doing this, only my ROKU. What else is there to try? With so many people having the same issue, it has to be something to do with ROKU.