I bought an (upgraded) Arcam dv27a almost 5 months ago, which for the last few weeks has developed a problem reading some of my cd's. A few of them the player cannot read at all ("no disc") and several others it will play after a few tries. The main bulk of my cd's and all of my dvd-a's and dvd's have no problem whatsoever. I had the player upgraded from a dv27 when I bought it, at which time Arcam installed the latest software. I have run a cleaning disc on occasion, but even a repeated run doesn't seem to help. Anyone any idea what could be wrong, and how to fix it?