Hi Duckey,
We need more information to help. Is it the cable box or a mobile device from which you cannot record shows? What is the make and model of the box? What error message do you get? If you have the New Guide, go under DVR List and to the Recording Manager, find the show and tell us any error message including the number in parenthesis.
Have you rebooted the box? Have you made any changes to your services or billing?
Where are you located? City? State? Zip?
Satch