Thank you for your post and we’re sorry you’re encountering issues with the unit.
Roon’s own diagnostic servers have not registered a ping from the Nucleus+ in nearly a week - if you’re unable to load the web administration page even after power-cycling the unit, you’ll need to connect the HDMI output to a monitor to outprint a BIOS diagnostic report.
This should show if the Nucleus+ has any logged hardware failures or isn’t receiving a network address. We’ll follow up from there. Thanks!