wrote:
It occasionally will work, but other times won't.
Since you said that, here is/are things to check/do.
#1 Some how and way make the Plex Server's IP Address Static. When I said that, I do not mean the external / WAN IP Address - I mean the Internal / LAN / NATTED one.
#2 If that does not fix the issue, please report back what the UPnP setting in the router is set to. At this time, do not change it unless you are sure of what you are doing.