I've had a Humax PVR9300T since the digital switchover.It's been largely reliable but I had to replace the hard drive around 3 years ago,now looks like the replacement is starting to fail.Recordings keeping getting out of sync so the audio runs a few seconds behind the video of it skips chunks.Sometimes pressing pause and restarting fixes the fault.As there's no way that I way that I can see to defragment or check the discs for errors I can't think of any other way to sort this.