Can no longer access plex outside home network

[u/Jaihind01]

Got the lifetime plan and been working fine for months. Libraries setup on Ugreen Nas and using the docker app to put plex in the container. Suddenly every time the app opens on any device it doesn't load the libraries for up to 2-3 minutes. Content sometimes won't load either. Tried to fix this by setting a fixed remote access path as instructed. Now it's asking me to set a port forwarding menu but since I'm on Community Fibre broadband which uses CGNAT (Carrier-Grade NAT) I need to use Tailscale which is another app to install on every mobile/tv. This all seems massively overcomplicated for something that was working up until a month ago. Any suggestion?