Adapter does not update alive status

[padman74]

Describe the bug
I have a Sonos move that is most of its time off. When turning it off, the adapter does not update alive status. It remains "true".
When restarting adapter, it turns correctly to "false".

Expected behavior
Update alive status with each status poll.

[Apollon77]

More details? Debug Logfile? Which state example you expect to change?

[macpo]

If you disconnect a Sonos box from the power supply, the data point alive remains true. If you then press Play (directly on the box) on another Sonos box, for example, the timestamp of the data point is updated and remains true.

[padman74]

The log file does not give much information. After some time the box has been disconnected from power supply, i see "Error: connect EHOSTUNREACH 192.168.21.146:1400" but it does not update the data point alive. I would expect the data point alive to be set to false.