Roon can't find devialet

[KraaijCheck]

So i received a few months ago a loan D220 to test my issue. I still have the same problems. Playing with Roon RAAT every day my D220 disappears once of more often in Roon for a few minutes and then comes back. When i use Roon Air is says "Device in Use" at the same time. Roon stays available at those times and i can keep playing music to my Sonos speakers in the garden, bedroom etc. I really don't know what could be the problem here. Could it be something in between my internet modem and the D220 that forces this problem that only the D220 experiences this???