I got the following setup: A smart plug powers down a Sonos speaker, which is controlled by a Symfonisk remote from Ikea. Once I turn the power of the plug down and power it on again, the remote does not work anymore. When looking at my automation, I can see that the Sonos speaker vanished from the list of entitys. But I can choose it as a device which instantly makes it visible in “entities” to and makes the remote work again. Any idea what could be the reason for that problem and how I can fix it?
My guess is that the speaker is marked as unavailable when you power it down and when you power it up it will eventually update it state and become available again.
This process is not Instant though, so have patience.
When you try to interact with it then HA request an update and thereby force the process of availability.