Update: Cloudflare had issues with certificates after some doman changes. It has now been routed to new IP addresses. Please try and report back.
Hopefully the problem for Ontario Canada users is now resolved.
With regards to IP bans mentioned for some other users, the next beta release of Plex Media Server will have a fix for a caching issue that resulted in multiple repeated requests being made unnecessarily and should hopefully avoid any rate limiting and temporary IP ban
There have been a number of updates to Plex Media Server since the Cloudflare fix that also relate to the EPG and improve and correct bug in the EPG refresh - please make sure you are on the latest beta which is 1.12.3.4973
Summarizing the recent fixes
A hotfix release for a bug that gave rise to lost airings and recordings between 00:00 and 01:00 GMT on the day the EPG is refreshed is now available as beta release 1.12.3.4973-215c28d86
See Release Note
(DVR) Keep airings in US primetime from disappearing from the schedule on each refresh (#8448)
and before that in 1.12.3.4947 reducing requests to Cloudflare
(DVR) HTTP request cache should properly check for file expiration when requesting celeb/series data. (#8405)