Firstly check that your symptoms are the same - can you watch live TV & OnDemand? These don't use the hard drive.
While on live TV, pause the programme for a short time and resume - you're now using the hard drive.
If you're sure the HDD is the issue, the quickest way is to call VM to report your fault. 150 (from a VM phone) or 0345 4541111 (from any other phone) and choose the "I have a fault" option. Or wait on here for VM staff to pick the post up - which (on current timescales) may take a day or so.
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I'm sorry to hear you've been having issues with the playback of your recordings. If you're only experiencing poor quality on the playback of your recordings, this would indicate an issue with the box's hard drive and would mean it'd need replacing.
If you could please get back to me and answer @japiits questions, that'd be great. We can then further identify the cause of the issue and go from there.
Pausing live tv does give problems but not as bad trying to watch a whole recorded programme.
According to the hdd usage it was at 54%
I have found that by deleting a load of pre-recorded programmes taking usage down to just over 30% - the situation improved immensely but not completely eradicating the issue. So basically I'm can record and watch it later but have to delete it straight away otherwise any recordings etc. Made over 35% get corrupted.
Thanks so much for all those details, so it does definitely sound like a hard drive issue to me.
Would you be happy for me to arrange an engineer visit so we can take a look at this issue in person and replace the box for you if needed? If so, kindly pop me over a PM confirming your address and I'll be happy to get that arranged.