Seems like my PDP 503 HDE media box has developed a little quirk...it seems to 'forget' that it's meant to deliver teletext on a consistent basis. Problem developed a few weeks ago, however if you disonnect the unit from the mains then reconnect after 20 mins or so it comes back. Unfortunately when you next switch into standby off and then restart - it's gone again. It just comes up with message saying "Teletext not available" and you are obliged to go through the power down process once again. Have tried resetting the unit using procedure in manual (button on the front) but that doesn't work either. Likewise it's not the aerial as I have other TV working 100%.. Another interesting effect is that it now takes up to 15 secs from pressing standby to ignite the screen. Can't remember exactly how long it took before but I can't remember it being that long. Grateful for any suggestions anyone? tks.