I have just set up my PACE Twin digibox and all has been well, until the last few days I seem to have lost BBC THREE and FOUR. On Friday night it was breaking up horribly, then on Saturday it went completely, giving me a "Channel Not Available" message. I could get BBC Parliament and CBeebies ok though. Oddly, my signal strength was down to 42% on Friday, but last night was back up around 68%. Do I need my aerial realigned possibly? Do I have a prob with Multiplex B only? My aerial is in the loft but 4 floors up and I get great analogue reception even without the aerial connected! Picture on all other Digital channels is perfect. Any ideas? Thanks all.