In my email exchanges I simply reported my HDCP issue with details on my setup, the observed symptoms, and the troubleshooting steps I had taken. After the first few exchanges, subsequent emails did not contain any actionable information but rather simply served to confirm that Roku was continuing to work on the problem.So, that begs the question, "What info did they give you in their email updates that helped you to solve the 'HDCP Error Message' problem?"
If you would share that with those of us who are still plagued by this annoying problem maybe I (and others) could avoid returning it.
There can be a host of causes for HDCP errors; in my case it did not appear to be due to any factor on my end relating to equipment, connections, etc., and my conclusion is that it was a software glitch introduced by a FW update that was roughly coincidental with the first appearance of the errors. That conclusion was reinforced when the glitch, which had begun suddenly out of nowhere and had been occurring consistently with every viewing session for five months, disappeared at the end of December never to crop up again to date (three months and counting).
But your situation is very different from mine and is probably unrelated. I got the error each and every time I started a viewing session and could only clear it by rebooting the Ultra. You have a different model and are reporting very different symptoms. From my reading, Roku devices have been historically infamous for introducing these HDCP errors. My only suggestion, if you want to hold on the Ultra, is to report your problem via email and then keep in contact until you get a resolution, knowing that it may take some time.