How to set Device volume control?

For whatever reason, today, my iPad remote shows my Moon390 device Volume control is fixed and does not allow the iPad to adjust the volume. Says Volume control is fixed. When I go to the device settings I have device set for Device volume. It has been working for years so what is going on , what am I doing wrong? Only thing I can think of is that we had a short power outage a day ago. But we have many power outages (california, you know) and all I ever need to do is reset the core and everything works as before. Help please.

Maybe try rebooting the Moon as well?

and pull the USB cable out when you reboot it…USB has a habit of keeping USB interface logic alive enough that will survive a devices power down…pull ALL the plugs is my advice.