Hi @mcgoonola, welcome to the Sonos community and thank you for reaching out to us. Let me help you with this.

First, I’ll be asking you some questions to understand what’s going on.

1. Any update or changes you made recently with your network?
2. Aside from the error message “can’t find server”, did you get an error number?
3. Is the error coming from an External drive, Internal drive, or NAS?
4. Have you checked your antivirus programs/firewall settings to ensure that it's not blocking Sonos?

It would be great if you can submit a diagnostic report and post here the confirmation number to check your system. We’ll wait for your reply.