I think this has been covered for D5.1 channels, but my system is just Sky HD box stereo into a Philips 9830 via HDMI cable. Every few minutes or so you get a very short sound dropout on live TV. Seems to happen on most channels. On a couple of occasions the sound has disappeared completly and I had to swith the box off/on to get it back. Also, changing channels seems to take a second or so longer than normal, with a visible blue screen displayed between channels. This only seems to have started a week or so ago, previously I had no problems. Typically, the HD box is now out of warranty. Does anyone know a procedure to reset the HD box to clear this? Or is it a source problem at Sky. Or is the box duff. Any help appreciated.