Sever is unreachable but running on DS918+

I’ve been running my server from the DS918+ for a few months now with no issues.
2 days ago i woke up and it couldn’t connect. I updated the software manually and it reconnected.
Woke up this morning and it can’t connect and i can’t fix it.
I’m still relatively new so please be stupid clear in any suggestions you have.
Trying to access locally from plex.tv client. Says it can’t connect securely then insecurely.
I can’t even see how to access logs or settings to attempt to make changes.
I tried to launch the local plex wed app but either i don’t know the plex ip address in the NAS or it’s not running either.
Help please!