Tony,

Some of those have happened in the past but few with any frequency save possibly the starting at a different song and I believe this is due to a wiring problem in the car which I have to isolate. That said this looks like something it would be worth doing anyway so I'll follow all the steps sometime over the next week when I have time and let you know if it works out. If not then it looks like it might only need a new drive which wouldn't be the end of the world.

Paul.