Since the last update. My Roku Tv has a glitch that is very annoying. Out of nowhere it has this issue that it repeatedly turns of and on. I have unplugged and waited 10 min. I have taken the batteries off the remote and other remotes. I have lastly do the reset button on back of the tv and that holds off for a few hours and then its back to the same problem. Nothing on the web provides a sure fix. Come on Roku and Hitachi and TLC all your tvs are messing up provide an update to fix this issue.
Have you tried contacting Hitachi support yet to inquire further? I'd suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support for their products running the Roku OS.