to quote a user:

"I have a dual dvb-c card, and some other ones too. I notice that when I'm watching TV, no epg is downloaded at all, no matter if i use one of the dvb-c's or just a plain analog one to watch the TV.
As there is always one or two dvb-c cards available, it could use it to download epg data right?"
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The EPG grabber logic is to only grab EPG when all tuners are.

This should be changed in a way so the EPG grabber will work even though other cards are busy.

There is no reason to only grab EPG if ALL cards are idle.