A few questions…
- did Roon 2.0 work before you changed your ISP?
- have you restarted all your devices? Router, modem, remotes, SonicTransporter?
- did you restart Roon Server? You can do this via this screen of your SonicTransporter:
If nothing works, you might need to delete the Roon Server app from your SonicTransporter and then install it again and restore your backup. I assume you do have a recent backup…