I forgot to come back to this, but apparently the solution was to let Unraid/Plex run cause it was handling some maintenance, it took about 20-30 minutes before I could start using the system again.
Morning,
I updated plex this morning and this happened:
"This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Response code="503" title="Maintenance" status="Plex Media Server is currently running database migrations."/>"
I'm not sure how to fix it or rollback the update.