Roon not playing on Devialet Expert Pro 220 over etherner

Roon Core Machine

ROCK - Standalone PC with Intel i7 - has been running perfectly for years
Operating system - version 1.0 (build 227) stable
Roon server software 2.0 (build 1143)

Networking Gear & Setup Details

Ethernet, nothing changed on my network in the last year

Connected Audio Devices

Ethernet connected to my Devialet Expert Pro 220

Number of Tracks in Library

26,325 tracks in the library

Description of Issue

Devialet Expert Pro 220 does not play with Roon if connected via Ethernet - Roon app shows that the music is playing and everything seems all right except no sound coming out. If I switch to USB input on Devialet (from Sonore Ultrarendu being fed from my Roon server), everything is ok, so the amplifier functions perfectly. I am not completely sure but I suspect it stopped working after recent Roon upgrade. I am running the latest version of Devialet firmware from 2020.

In Roon - Devialet Expert Pro appears in the “Roon Ready” section but suddenly with a text below “Uncertified”, I am pretty sure it was not there before

Turn off your Roon Core.
Power off Devialet.
Unplug Devialet from wall socket.
Wait 30 seconds.
Restart your router and switches.
Start your Roon Core.
Plug Devialet into wall socket.

Works!! Thanks a lot!

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