@David_Ohm Roon displays all the devices it finds and offers to use them. When devices are removed as hardware, they are removed in the same way as when you remove a device driver installation on the (operating) system. Other applications may still need them. Roon only shows what is installed.
This has happened to other users of Hegel and I had it on my Naim Atom every time it’s restarted. I think for the Hegel user it was related to an mDNS repeater being active on their network. Roon were supposed to have been looking to fix it, looks like they have forgotten that one. Never got a fix for me so I just turned Airplay off.
Thank you for the report here! I spoke to the team about this one and this is most likely related to mDNS caching these values, potentially on your router. We are unable to reproduce this issue in the lab, so we are unsure what setting needs to be changed, but if you have any mDNS settings related to caching on your router, you may want to try to disable this.