Okay, thank you very much for the info.
Currently we don’t feel as though there is anything to be concerned about with this. We have had several units monitored at the factory for this and none have woken themselves up either. No other reports have come through to me about the issue still occurring.
Given that it is one unit, and no others have displayed the fault, I am fairly confident in saying that the cause is not the same here. The most likely explanation of a single unit waking up from standby a single time is usually down to mains.
The reason for asking about your power supply set up is that if the Bartók is in standby and loses suitable mains power, say from a brown-out, it will fully boot and be awake when the power returns, not be in standby. Another alternative (though not in this case) would be that Spotify, if connected, could wake the unit from standby from anywhere in the world, hence asking about that.
I’m not sure exactly what caused your unit to wake up this time, but I would be very hesitant to say it was the same cause without others doing the same. I would however be interested to know if the unit repeats this behaviour in future.