Our DHD 4000 has developed a couple of problems - For a couple of weeks the programme description text in the EPG has been a little disrupted - there's inverted commas above every letter "e", and occasionally other letters. More recently, and more seriously, over the days few days we've had spells where the some channels are lost or mixed-up. It rights itself after a few days, but until this morning we had no Channel 4, no ITV2 and - strangely - E4 appearing through the ITV2 setting. Where the channel is not present, the screen shows black - but with a soft greenish square (size of a beermat) halfway up the screen on the right hand side. Very odd! It's about 2 months old, running software 1.7.7 and we've never needed to update/change anything before now. This is the first complaint we've had. Anyone experienced similar, or got any suggestions? Thanks a lot.