I just checked the Shield, no CEC.I have a similar setup (930E and 2019 Shield Pro) and have zero problems after turning on IP Control. Do you have any of that power on/off CEC stuff turned on in the Shield? Maybe that’s the difference?
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I do have Bravia Sync control enabled for ARC to my Denon X2200W AVR. The Sony has both
Device auto power off and TV auto power on disabled.
I also have an HDFury Diva between the AVR and TV. All my devices are plugged into the AVR.
As an experiment I could disable Bravia Sync control and just use optical for TV to AVR.