UPNP keeps getting turned off every couple of days but sometimes (rarely) last several weeks!

I need to use UPnP or sometimes called Device Discovery.

I have read many posts about this issue.  I use port forwarding for one computer for PLEX but I have two PLEX computers/servers and port forwarding only works for one computer on a Local Network.  So UPnP is the only option for the other.  Once UPnP is enabled, I need to check every day, which is not easy when you travelling.

The only official solution that I've seen from Xfinity is to buy another modem and operate the Xfinity modem (XB8) in Bridge Mode. Is this still the official solution?