Upnp servers dissapearing with n-stream 3.4

Hi, I am having this issue since I upgraded to n-stream 3.4 i.e. Minimserver in particular, but also the Synology Upnp servers are present when I start the app but then as I browse the folders they dissapear get the message that the Upnp server is not availableis not appearing in the Upnp server list in the app while it is perfectly visible, and playing, in the NDS.