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?