HDCP errors are constant and frequent, but intermittent.

Hi makaiguy Thanks for the answers. I will address your questions below: 

> Does this seem to correspond to when your programming switches into, out of, or between programs or commercials?

Nope. It is random. For example, we will be watching a movie and it just happens. Strangely, it happens right about the time a critical line is going to be spoken! But seriously, it is random while just watching some channel or movie. When I switch channels, I get black for a moment, but no HDCP error. 

> Under "Settings > System > Advanced system Settings > Advanced display settings" does your Roku have an "Auto-adjust display refresh rate" item? If you don't have this setting, the rest of this post doesn't apply to you.

I do indeed have this setting. 

> If this is enabled, the Roku circuitry sends the signal output at the refresh rate (frame rate) used by the original source material, commonly 24 fps (frames per second), 25 fps, 30 fps, 50 fps, or 60 fps. Every time the source frame rate changes, the TV must adjust its display to accommodate the new frame rate, which on many sets results in a short blackout.  I've not seen your HDCP error reported as part of this transition, but it does sound plausible.

I thought about this and tried both settings. No difference. It does happen less when it is "off" however. 

> If "Auto-adjust display refresh rate" is set OFF, or if your Roku does not have this option, Roku converts everything to a frame rate of 60 fps and the TV doesn't have to adjust on the fly.

This is where I am set now, and the results are better. 

>The tradeoff here is that movement of things on the screen for non-60 fps sources may not be as smooth with no refresh rate adjustment, depending on whether your Roku or your TV does a better job of refresh rate conversion. You have to decide whether this change is worth it to you.

Understood. Reminds me of the old 3/2 pull-down conversions of film to video. So I had it on to eliminate that "stutter" one gets one frame rates are not the same. 

I notice this HDCP problem mostly on movies, but occasionally on new programs as well. I do have a long HDMI cable from the Denon to the TV, but still under the maximum lengths recommended. And I am not sure why that would cause this error. I am seeing the error from the Roku, not the Denon. 

Frustrating at best. What the device needs is an HDCP "off" setting so this problem does not happen on unprotected content.  I used to own a DVDO up-converter box that had that setting. Video was much more stable when used. I may have to pull that box back out. Only issue, it does not support 4K  😞