OceanDad

What happens if you take the Denon out of the chain ? Do you manage 4K/60 HDR without a problem ? Might be worth trying just to narrow in on the issue.

Following with interest, specifically to see whether the AV-Pro Edge kit can do this reliably. Out of interest have you ever tried a 4K Apple TV box through the same setup ?

Pretty sure that the best that you will do reliably is 4K/60 non-HDR. If you can manage to set that manually, it should work OK.

What do you have your Roku Settings ----> Video set to ? Auto ? 4k/60 ? 4k/30 HDR ? What firmware are you on ? Roku 9.2 seems to have given a lot of people HDMI handshake issues, especially when fed via an AVR. I see issues on mine at 4k/30 HDR, but no problem at 4k/60.

What device(s) have you lost volume control of ? AVR ? TV ? Are these devices IP controlled or do they use an IR bug ? Hard to offer advice unless you give us a bit more info to work with. Common problems are a change in IP address or an IR bug becoming dislodged, but that will affect all control of a device, not just volume.

Hope you get it all fixed quickly. Both the headphones and the glitches in your C4 system. What seem like major issues are often resolved with tiny tweaks. I've been in two local houses recently where they had expensive installs with terrible integration. The homeowners of course 'didn't know what they didn't know' and assumed that this was how things were supposed to work. 30 minutes of tweaking later, and they are amazed at the difference.

It's a simple and reliable solution, for sure. But maybe not that convenient, that's all. Using an auto-connecting pair of headphones just seems easier, and therefore likely to be used more often. That said, in this particular instance, it seems like it's at the bottom of a longer list of problems 😪

Just try unplugging the power and rebooting the TV before you throw the towel in. But your call of course.

OK - assuming that you can get to the back of the TV, or the socket that it is plugged into, can you unplug the TV from mains power for about 30 seconds, then plug it back in and see if you can get it to turn on via the LG remote. Sounds dumb, I know, but it often fixes an unresponsive TV.

Do you mean from the monitor output of the Denon to the LG TV, or is this an HDMI cable that goes from your Control4 controller to your TV ? What happens normally when you press the Red 4 on your remote control - do you see an on-screen Control4 navigator ?

Can you use the original LG remote ?

One more question. What sources are you using ? Do you use the apps built into the LG TV as your source for things like Netflix, or do you have a separate box (like a Roku or Apple TV) connected to your Denon ? I'm trying to imagine how the TV and the Denon are wired together.

I'm talking about the TV settings. In the Sound Menu, scroll to Sound Out and see what it is set to.

This would appear to be two separate problems. Have you ever lost control via the remote before ?

What do you see in the settings under Sound--->Sound Out ?