Remote playback fails on resume.
Not sure exactly when this started as I haven't used Plex outside my network in a while, but when I try to resume a video from outside my local network playback fails with the message: "Playback has stopped because the connection to the Plex media server has been lost. Please ensure the server is available and retry." If I start the video from the beginning, it seems to work fine. This is happening with the android app as well as a PS4 at a remote location.
As for troubleshooting, I've tried restarting all networking equipment, servers, and clients. I've created and verified manual port forwards, and I've reinstalled both server and client apps. I've tried to attach a clean log showing what happens when I try to play a file. Hopefully this helps.