To expand on the advice given... you've not explicitly said, but check that live TV works ok - this proves your signal feed.
Pausing & rewinding live TV is effectively a recording and uses your hard drive in the same way, so if that's problematic then yes - you have a hard drive fault. It can't be repaired and will mean your box being replaced.
You can either call in (150 from a VM phone, 0345 4541111 from any other phone) and follow the options for "I have a fault with my TV service", or wait on here for staff to respond, that may take a few days.
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