We would be more than happy to look further into the issue for you, but need more detailed information.
-Roku device model, serial number, device ID, and software OS/version (these can all be found in Settings > System > About) -What is your TV resolution? With more information, we will be able to assist you further.
I got an HDCP error this afternoon for the first time in a long time with my Ultra 4800. I do have 11.5. I was in the middle of watching the latest episode of House of Dragons on HBO, so I did not stop to create a trouble ID tag, sorry. I was watching it in 4K/Dolby Vision and Atmos audio. The sound continued, and the error message was only on screen for about 3 seconds or so, so really didn't miss any of the show.
I had not seen that error message in many, many months, so it's certainly possible that it was an outlier anomaly.
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Interestingly, all of my Rokus updated to 11.5 except the one that had been downgraded to 10.5. That one says it’s up to date. And my two Roku TVs without add on Rokus (I normally don’t use integrated apps) aren’t updating either, so I guess TCL hasn’t released their update yet.