You've not mentioned whether you have any issues with live TV, so I'll ask.. do you?
If yes - then that's the underlying problem and you likely have a signal fault.
If no - try pausing live TV for a short while and watch it delayed, this is also a recording and uses the hard drive in the same way.
You can report service faults one of two ways - calling in (150 from VM, or 0345 4541111 from any other phone) or waiting here (might be a day or so) for staff to respond.
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