Qobuz has networking problem only in Roon

Do any of our regulars recall a lengthy thread a few months ago where a very sweet older lady (who was a writer) was having issues with a professionally installed network?
I can’t seem to find it.
I’m wondering if the solution that was eventually found would be useful info for @Gesper to pass along to their provider?

Edit. I found it.
And the solution may not be as helpful as I’d hoped.