It's happening to mine too.
Do you think its a software update issue or the tv itself?
Sorry posted on the wrong question.
I have a Roku Ultra that is flickering not a TV with Roku.
This same exact thing is happening to mine too. I've unplugged it for a whole night, and even reset the factory settings on the tv and nothing works.
Anyone know what to do?
This is what mine does and exactly at this rate. Which makes me think it must be a design flaw causing interference of some sort. I haven't thrown my tv out because I believe there be a fix available, but so far I have not found one. I talked to a guy at a repair shop who didn't even want to look at it! He assumed it would be an expensive repair. I am not sure this would be true, but so far no one has answers for me.
If it is a fault in the tv, it is a design flaw. I've been hoping for an update that would fix it. Question for you: are you wired or wireless? I've debated buying cords to see if it is a signal disruption. But after trying several various conditions, I couldn't find a source. Must be in the tv itself