For some time now, probably a few months, I have found recordings that are all black. By this I mean that recording has the expected length, but all you see is black with no sound for the full length. It is as if the recording has been made from a source that is not connected.

Not all recordings are like this, but the number seem to be growing. There are more such recordings on some channels than others. I used to make a lot of recordings from BBC Earth, and in the beginning a few recordings were black, and then the number grew, and right now it looks as if all recordings from BBC Earth are black. But other channels are hit too. Now I record every broadcast of the series I want, even if there are two or three of the same episode, and mostly only one episode is recorded black, and the others are OK.

I have once watched a programme on BBC Earth while it was recorded, but when I looked at the recording afterwards, it was black.