I have a hopper 2 that has had many hard drive failures in the past year and a half. I do the unplug reset sometimes I lose everything some times I don't . It's still the same drive that came with the box so I personally think there is more to the so called drive failure. It makes me think it is also a software bug .
My own experiences with the Hopper HD fiasco are posted back a year or so ago. To summarize, I don't think it's so much a "bug" as just a failure to try to correct non-catastrophic errors, preferring to take the easy way out and reformat the drive instead.
(I've built many computers that ran 24/7 for years with consumer-grade drives. The only time I've ever lost more than a file or two [which in itself was rare, and usually the result of something like writing on a Linux partition from Windows or vice-versa] was a catastrophic hardware failure of a proven-bad brand of drive -- which, ironically, was advertised as high-quality, almost server-grade! [IBM Deskstar 40, or was it 80?])