Please ensure you run with debug logging enabled on the server
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
With debug logging already enabled, restart the server before doing any test
Try to tune a channel that should be working
Note down time of failure and download the logs zip and attach with the details of what failed and what client was being used
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
