I have my Sky HD box connected to HDMI1 of my Panasonic plasma. When I switch on the Sky box the telly should (I'm lead to believe) auto-detect it. Here's the sequence of events: TV on. Switch on Sky - no change to TV. Switch off and then switch back on Sky - TV displays Sky. Switch off Sky - TV displays built-in freeview. After 15 seconds TV switches back to HDMI1 even though Sky is off! Screen black. I have to press the TV button to get freeview back. Can anyone explain what's going on here? Rebooting the Sky box seemed to fix it but only for an hour or so. Do I have a duff Sky HD box?