I have two subscriptions and the EPG for both stopped updating for most channels on Wednesday this week. I verified the TVG-ID in the M3U files via m3u4u.com and the original TVG-IDs wouldn't resolve. m3u4u recommended different TVG-IDs that worked.
TVG-IDs don't change do they? Why would the EPG for multiple subscriptions stop working at the same time and why does m3u4u provide different TVG-IDs?
There are no standardized TVG-IDs and every service can have their own and they can change them at any time. It happened to me with XEEV a number of times. I know it doesn't help with your issue, but just FYI.