Just received my Nucleus one yesterday, hooked it up using an ethernet cable and it was up and running quickly by going on Roon with my computer and switching from Mac mini to nucleus as my core, I use a tablet to control my Lumin U1 mini and today it can’t find the Roon core?
Thank you for your post. It looks like the RoonServer instance in your Mac Mini remains active on this network instead of just the Roon app as a controller.
Is the Nucleus One currently still plugged in via ethernet and powered on? If so, share a screenshot of the Web Administration page here.
Please list the network hardware involved, including any routers, switches, or nodes/access points in your setup. We need to know precisely where the Nucleus One is connected via ethernet relative to your Mac Mini and to your Lenovo tablet controller.