My son has a Sony Bravia KDL W4500 television and is having trouble with loss of picture via HDMI from his Sky box. This happens without warning and moving the cable sometimes returns the signal and sometime not. Switching the tv on and off sometimes returns the signal and moving the HDMI cable to one of the other connections results in a poor picture. Before he contacts his tv supplier to complain about his Sony tv, has anyone else had a similar problem with their Sky box? The box is a Pace. Any ideas?