I don’t want to muddy the waters, as your post is about an issue specific to you, but I’m having a similar-ish issue.
I’m across the pond in the States and subscribe to cable. Everything was once fine, but after the last EPG outage, I noticed things were amiss when I was finally able to get the guide to update. The lineup I was using lost almost all of its channels and there really isn’t another choice to make, as channels are extremely different from provider to provider.
Some of this may be moot as the EPG provider is apparently changing at the end of the month, but it’s still a rather annoying issue.