Annoying "Not Connected" Message When TV Switches to ATV4 Source

I use my Apple TV 4 as one of the three input sources to my new 65" Samsung 4K TV. The TV uses its proprietary Anynet+ (HDMI-CEC) system to control switching and control of the three inputs (the other two are the cable box and a Blu Ray player). This works beautifully except when I switch to the Apple TV 4 as the source. The TV screen then displays a message saying "Anynet+ source not connected, please check connections" for about a minute. All is otherwise working properly with picture, sound and control. The message goes away after about a minute, but is an annoyance in an otherwise properly working system.

This did not occur with my previous ATV 3. It just switched on and worked seamlessly. Only started happening when I replaced the ATV 3 with the ATV 4. My layman's view is that there is some quirk in Apple's application of the "HDMI-CEC" standard to the new ATV 4. Just one more reason why I am not particularly enthused about the ATV 4 over the ATV 3.

Has anyone else seen this kind of thing, and do you have a recommended fix?

If I don't receive any input here suggesting a fix for me, I will also write this up as a problem needing correction, on the Apple site.