My PDP-435XDE Pioneer has a bug whereby it frequently loses its memory of digital channels. This is obviously a pain as whenever this occurs it necessitates the lengthy reinstallation process. Pioneer sent a technician out to do a "firmware update" and when that didn't work the dealer replaced the media box. All to no avail. This problem only happens if it has been turned off. In other words it's OK if left on stand-by. I don't regard leaving it on stand-by as a fix, especially with recent publicity on the un-greenness of the waste of energy of so doing. The aerial has been checked and is good. The set isn't mounted on a large magnet! Anyone had the same problem or got any ideas?