There is an issue with EPG refresh that our provider is looking into. A banner has been added to the forums mentioning the issue.
The problem manifests itself with errors logged within the Plex Media Server log files like this
ERROR - EPG: JSON parse error. Wrote JSON data to "xxxxxxxxxxxxxxxxxxxxxxxxxx /Plex Media Server/Diagnostics/EPG-onconnect-xxxxxxxxxxxxxxxxxxxxxxx.json"
Glad to see this is now being addressed 
Although, I’m not seeing that error message in my PMS logs:
mini:Plex Media Server plex$ pwd
/Users/plex/Library/Logs/Plex Media Server
mini:Plex Media Server plex$ grep -i "ERROR - EPG" Plex\ Media\ Server.*
mini:Plex Media Server plex$ grep -i "EPG*json" Plex\ Media\ Server.*
mini:Plex Media Server plex$
Glad to see this is being addressed - it’s been around for a while!
Another “me too” - also in UK with Freeview. Fingers crossed this gets sorted
The JSON Parse Error issue where the response contains error 403 Forbidden should be fixed now.
Additionally Plex Media Server beta 1.14.0.5465 has retries for failed requests to fetch the guide - so that in itself would have helped whilst the issue was there
Please do manual update to the guide and once that completes ok, then incremental updates would ensure the guide remains up to date
If problems persist, please provide fresh logs from the server with debug logging enabled beforehand and also a zip of the Diagnostics directory which is within the Plex Media Server data area
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
https://support.plex.tv/articles/202915258-where-is-the-plex-media-server-data-directory-located/
