I get the same sometimes and it's really annoying!

It seems to happen to me when I start up using something other than Sky (say music/TuneIn).

I have tried many things looking for a workaround but the only way I have found to rectify it is to reboot the entire system. It's almost as though the Sky box has not woken up and confuses the system but I don't know if you use Sky.

The volume control still works fine in the B&O app while this is happening so if you do find out how to cure it please let me know.

Turn off CEC in the LG menus.

Turn off CEC in the LG menus.

Please let us know where this is as I cannot find it

Found it 

General then Network.

Will see what happens.

Many thanks

Blank everything - quite a scare!

Had to reboot the system but at least I got a picture and this time the audio was displaying the problem I had hoped to cure.

Turned the CEC back on and at least I have everything back now.

thanks, i can only find the CEC setting in Connection-HDMI device setting-simplink(HDMI-CEC)， when i turn off this menus, the LG screen can't synchronous ON and OFF with the B&O base station.

BeoMegaMan wrote:

Turn off CEC in the LG menus.

Having changed the CEC back the only thing I have altered is to switch the Auto  Device Detection on.

I will see if this makes any difference but the problem seemed intermittent so it may take a little while to see if this cures it.

Beovision Eclipse and Beovision Harmony support CEC on all HDMI sockets. CEC allows control of connected equipment without the use of PUC cables as it works via the HDMI connection.
 
Different vendors have their own understanding and implementation of CEC, and some equipment will not work well with the TV. There is often a lot of limitations when using CEC, and we still recommend using PUC when possible.
 
The CEC will remain active until you configure a PUC control for HDMI. When the PUC is configured, the TV will not send CEC control commands, but will only control the connected device via IR PUC.
 
When using PUC together with a device that supports CEC, it is important that you disable the CEC.