I have a feeling I am also suffering from the QNAP problem. I run Roon Core on a QNAPS TS251 with a USB SSD. Since a recent update none of my devices running Roon can find the core. And according to the Roon Server page, the server is ‘stopped’. The QNAPS firmware version is 4.3.6.0959 Build 20190531. All help gratefully received!