Expert Pro Turns On Unexpectedly

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Thanks for the suggestion, @Jean-Marie, I'll try that.

By way of an update: I noticed the Apple TV has a setting "Airplay & Apple Home" -> "Peer-to-Peer Wireless" which was enabled.  I believe this setting is only present if the Apple TV has a hard-wired Ethernet connection, and it enables devices to connect directly to the Apple TV without being on the main network.  If I understand correctly, it uses Bonjour as a discovery mechanism which of course uses network probes.  As an experiment, I disabled this and - after an hour or so - my Devialet hasn't woken up again.  Fingers crossed.

If that continues to work, it might be a good-enough solution for me.  Alternatively it might suggest that disabling the Devialet's wi-fi interface might stop the unexpected waking-up.

In case it's relevant, I forgot to mention that my Apple TV is running tvOS 26.1.

(Full disclosure - I also changed the batteries in the Devialet's remote control, thereby breaking the first law of debugging by changing two things at once.)