Hi Noris, thanks for your reply.
The message came up again this morning.
I restarted the just the roon server, not the Antipodes hardware and the message is gone temporarily.
But I did that several times before and it keeps coming up again after some use.
Besides of the occasional lags for search results (happens several times a day and results need up to one minutes to show then), I do not have any dropouts or playback failures.
I will connect the Antipodes server to a Zyxel switch instead of connecting it to the repeater and see if wiring per cable changes the behaviour.
DNS was by default the providers servers. I just changed to the suggested Google DNS.
Best Regards
Matthias