Failed Recordings

I’ve just noticed that over the last few days all of my recordings have failed, despite the red recording light being on for the duration of the record. With series records, the files show up in the directory as 0K, with one offs or live recording, there is no programme file.

Any ideas what’s going on here?
Plenty of disc space.

I won't do a factory reset until I've tried my new aerial out (in thread below this), I need to keep the existing tuneings to judge if its working or not.