I do not know if my card has a bug but it runs some channels even without me topping it up.
Mine is the non paired conax card.And as i said a couple of channels work without entties.
Normally if you have prepaid card like Smart HD you can prolong it or not. This is prepaid you pay you have not pay not have but on this card is one exception when your payment finish you can watch some basic channels which in Poland is broadcasting on DVB-T. This is not all time but for some part of time. Ususally is about 30 days when your card expired.