Plex server UPNP stopped working after couple of days

Hi all,

Strange problem overhere

- have the latest 3.0 n-stream (on iPad)

- plex as UPNP server

- superuniti

Installed the above and it worked fine first coule of days, got sound, all the pictures.

Since last weekend: see all the pictures but cannot play anymore.

Its sometimes says, lost connection to server.

I have also iTunes in the plex library (music channel in N-stream). This works fine again. Have sound and pictures. 

anyone understand why the direct Plex UPNP stopped working?