When watching recorded programs at some point its different every time the playback stutters, stops and starts and jumps back a few seconds, it generally lasts between 15 and 30 seconds before it recovers and normal playback resumes.
Box is only a few weeks old as was recently replaced for a different reason. Have tried turning off and on again and leaving programs on after watching in case there was an area of bad sectors on the HD but nothing seems to have worked so far.
Thank you for your message, I'm so sorry that the playback hasn't been working as it should be. I've been looking into the box and I can see that the box has been showing some errors on the hard drive. I would like to send out and engineer to come take a look for you. If you can have a little look inside your Inbox, you'll see I've sent you a Private Message. You can find this at the top right of the page, purple envelope.