I recently upgraded to 6.12.2, from (I think) 6.5.x. One of my switches had a brief disconnection, and since that point, I haven't been able to access to web GUI from a browser (http://[local ip address]/Main). Other connections like SMB work just fine. And I'm still able to locally access the terminal. Rebooting the server did end up resolving the issue. However, this issue has happened again (switch had an interruption, web GUI stopped working). So this time I went to the machine, logged in to the terminal and ran `diagnostics`. The text cursor went to the next line, and nothing happened. I went to bed, came back the next day, and it's still nothing. I attempted to run `diagnostics` via ssh, and the same behavior is happening. And I did verify there is no new diagnostics file generated.
What are the next steps I can use to diagnose this issue?