Can't use Plex anymore on my Asustor



Everything was working fine. Then my wife installed the app "pop corn time" from the app central.
1 hour later I was watching an episode on Plex and in the middle of it, plex stopped.

I launched it again but the message "servers not found" was displayed.

Since then I wasn't able to watch any of my videos as the servers aren't found...

I've tried to re-initialize my NAS (factory reset), reinstalled plex média but it still doesn't work (servers not found).

Weirdly, I can access plex from another computer and see my files.. But not from my NAS where my files actually are..

Any idea how to resolve this?