OLED65C9 crackling sound after firmware update

After a recent update my TV now is making terrible sounding crackling and popping noises when it's off and only when it's off so far.

I do have a sonos beam sounbar connected through the hdmi arc port and a firestick 4k in a separate HDMI port.

Any thoughts would be much appreciated. Anyone else experiencing this?

Is there a way to revert back to a former firmware version to see if that was the potential issue?

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