ROCK Roon OS 1.0 (build 175) on a NUC8i7BEH newly installed and still in the process of setting everything up. then I started with remote access over Android and Windows and found the ROCK with a dynamic IP. I wanted the give it a static and entered for that 192.162.1.61 255.255.255.0 submask 192.168.1.1 gateway and then for the DNS 1195.186.4.162 (this I found on my router). since then the ROCK is searching for the network adress and cannot be found anymore by Windows or Android.
I think you need to change the DNS address. The default would be the same as your gateway (192.168.1.1), but you can also explicitly set it to be an external DNS server address such as Google (8.8.8.8) or Cloudflare (1.1.1.1)