Why does pfSense UPnP service only work for a few minutes?

If I enable UPnP in pfSense 2.7.0, it seems to work fine. I can run the command upnpc -r 1234 TCP and I get the response: List of UPNP devices found on the network : desc: http://10.0.0.1:2189/rootDesc.xml st: urn:schemas-upnp-org:device:InternetGatewayDevice:1 Found valid IGD : http://10.0.0.1:2189/ctl/IPConn Local LAN ip address : 10.0.0.93 ExternalIPAddress = [redacted] InternalIP:Port = 10.0.0.93:1234 external [redacted]:1234 TCP is redirected to internal 10.0.0.93:1234 (duration=0) I can run this command over and over again, with no issues. But after ~5 minutes or so, running the same com

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