Got close to throwing my PVR9200T out but when the Sky engineer told me that I could not have sky due to a rather large tree I started looking to the WWW for a resolution.
Found out that due to the switch over my box is now receiving signals from our previous transmitter at Mendip but also one in Wales, when looking at the EPG guide I had channels in the 800 range most of which were duplicates but my BBC1 & 2 were now Cymru...
To fix I deleted every channel on the PVR the machine then goes into automatic search for channels. Once the automatic search is complete, it has probably found 100+TV and 25+Radio, do not save the channels just yet. Start by selecting all channels then proceed through the deselecting all the channels that you would watch or listen, then you need to re highlight any duplicated channels so for instance you do not have ITV twice when saved (if like myself you live in the west country then it would be best to delete the duplicate from the front as these are the ones from the Welsh transmitter). When happy that all the chaff and duplicates are highlighted go to the delete button to remove from list before saving.
Hopefully your box will now respond as it used to in the good old days before the digital switch over, as mine now does.
JV, April 2010