I had the same problem. The TV and Roku are both brand new devices. I did a factory reset on the TV and didn't agree to any of their user terms agreements this time. Then I shut off every automatic feature in the TV settings. After that I shut off every energy saving feature on the TV and the Roku so it won't shut off on me. I'm not sure which one of these worked, but after 2.5 hours of frustration and small heart attacks, I'm finally watching my Roku!