if you have a problem please provide diagnostics so it can be investigated,
Run with debug logging enabled on the server
See https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
Restart the server to start a new set of log files
Open the Server Setting Remote Access page.
Do an F5 Browser refresh
See what public port it says it is using and test that on web site http://canyouseeme.org
If it fails, check that port forward still exists in router (if using one with manually selected port ticked and port entered)
If problems persist, collect logs
See https://support.plex.tv/articles/200250417-plex-media-server-log-files/
