We’ve had a Sky+ HD box for the last 4 years and it has served us well until about a year ago when we started to notice intermittent problems such as not being able to receive certain channels at times, occasional failed recordings and picture break up. This progressively got worse to the point where we could only receive a handful of HD channels and recordings would fail regularly.
After a bit of Google research it became apparent that a major cause of problems with these Thomson DSI8125 Sky+ HD boxes is a failure of the on-board PSU. The numerous capacitors used on the PSU were not of a particularly good quality and are prone to failing over time.
(It’s worth pointing out that I upgraded the stock 320GB hard drive to a new 1TB drive about 2 years ago but from what I’ve read I don’t think this contributed to the problem at all)
Luckily there are repair kits available which allow you to replace the failed capacitors with new, high quality replacements. One supplier of these kits which I’d read good reports about is Satcure. So, I ordered a component kit from them for the very reasonable price of £10.95, found a local electrical repairer to do the upgrade for £20 and we now have a fully functioning and rock solid Sky+ HD box again.