Error: Remote access error "Not available outside your network" on Synology NAS

Server Version#: 1.29.2.6364
Synology version#: 7.2.1-69057

I have been using Plex on my Synology NAS for several years but recently I have run into an error. If I go to Settings > Remote Access I can click the Retry button and access will temporarily work, but after playing for 15 minutes or so, I will get the same error. See screenshot below. Any suggestions?

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