Hello Pavel,
I have a different problem reported and I see some similarity to my problem.
ROCK won’t connect to internet - Support - Roon Labs Community
I don’t have a Qobuz account. In my situation I think connection to Tidal is always primary reason for all delays. Search result comes back in 4 minutes, but following search results will come back in seconds. After every reboot Tidal login is taking so much time!
Can I ask you what you mean with Cisco commutator? Is it a switch or router? Or what is the model number? There was a common past of Cisco and Linksys together. Maybe there is a common design in those devices. In your situation you have two different locations and different ISP, but having Cisco in both setup.
Enjoy The Music!
Emre