Had SkyHD for over 18 months now, I also fitted a 500GB HD about 12 months ago which has been fine. Recently while trying to play back a HD recording at the same time as recording another HD programme I got some audio breakup and the amp looses the 5.1 signal from my Thomson box. This problem was quite bad last night while trying to watch lost after it had been on live tv for about 10 minutes (the picture was also a little choppy) It plays back HD fine so long as it isn't recording another channel. Is the PSU on the way out? (I visually checked the capacitors about 8 weeks ago and they looked fine with no swelling or leaking.