Hi Boroboy5,
Just to cover some of the basics, do you have 1 box or 2, was the box on at the time or in standby, if it's in standby is the box set to fast start or active start and not switched off at the plug.
Which programmes have failed to record just in case someone else has had the same problem.
As a test if you are watching something can you pause for a few minutes and then carry on watching.