I’m having the same problem. The Home added new album page became unstable after the latest Roon updates (Core & iOS), some album covers are coming on & off repeatedly. I went to the Nucleus+ setting web page to restart the machine, got a red box error message that it failed to load properly. It failed to boot up properly after numerous attempts, powering it on and off. Now browser says failed to open page.
It’s bricked now. I’ve reported it on a separate post.