Roon Client on Win 11 loses audio devices

The Roon client is running on my PC (Win 11), the server is on a NAS (Asustor AS5402T). When you start Roon on the PC everything works initially, but after a certain time the audio devices on the PC are lost. Only network devices (for me a Homepod mini) and the NAS devices are available. The only thing that helps is restarting the PC client. Why is that? Solutions?

Look at the screen switch off setting. Also load roon bridge and have it start on windows startup.

This should not be necessary.