Fortunately I was able to break down the problem and solve it.
It was neither my Roon server, the BlueSound equipment nor the router. It was the powerline adapter that lost connection. I unplugged all of them, plugged them back in and we’re in business again.
Today, my Roon setup lost connection to all of my BlueSound players in my network. This just happened without any changes I’m aware of.
I rebooted my BlueSound Node 2i a couple of times, rebooted my router, rebooted my Synology NAS running Roon. All to no avail. The service just can’t find the BlueSound players. It can, however, find my Windows Roon player as well as my Android remote control/software player.
What’s going on here? Please help!? I can’t live without my music.