Thought that I should clean up my installation and ordered a STEEL CASE FOR HIFIBERRY DAC+/ADC, PI 4, V2. It is a solid case and the installation was straight forward BUT I run my Raspberry Pi/Volumio on my WiFi and that donot work when the Raspberry Pi is installed in a steel case (I have a strong WiFi signal in the room). I should of cause have thought about this possibility that the WiFi would be affected by a steel case (Faraday cage effect) but did not. Maybe a notification for future customers that if the base their setup on WiFi it might not work. As soon as I took out the setup from the steel cage everything worked as it use to.
Sincerely
Michael