A few months ago I bought a Philips 880 dvdr.( I am a total newcomer to dvd video) The shop multiregioned it for me, after two or three tries. Then when it still didn't work their man came to see the installation and said that the Nokia set top box was the problem and disconnecting that seemed to get it going. I have only used it about a dozen times since but each time something goes awry. EG the picture sometimes sticks, or the extra material on the disk doesn't play. These are all brand new disks. Are dvd discs usually like this or is it more likely to be the machine?