Apple TV and Panasonic Viera Link

Hi!

I’ve just purchased an Apple TV 4K and everything went well, every time I turned it on with the Apple Remote or the iPhone Remote the Panasonic Viera used to INSTANTLY turn on and set to the HDMI of the Apple TV

Until...

Until I’ve tried to plug the Apple TV HDMI to my Panasonic External Speaker (for home theatre) which is also plugged to the Panasonic TV itself.

I did it because someone talked about something about HDMI-CEC and I wanted to try it because the Remote was not working with WiFi (I supposed) and sometimes the iPhone remote used to stop control the volume (while the others controls kept working).

That’s when everything went wrong

The chain was working and the Remote started working efficiently through WiFi and control the volume as it was meant to do, same thing with iPhone Remote.

BUT the Viera Link wasn’t able to turn on DIRECTLY to the HDMI connected to Apple TV, it just turn on because it receives the input from the Apple TV which is turning on but then the Panasonic Viera is stuck on “No Signal” until I touch the AV button, that’s when Apple TV turns on.

I then re-plugged everything as it was but now when I turn on the Apple TV, the Panasonic TV turn on but it needs a lot of time to recognize and show the Apple TV while before it was a matter of a fraction of second.

Also tried resetting the Apple Tv

What can I do?