I think I have solved the problem. It might be a case of RTFM. I found a firmware update on the plextor web site. I did not know that the recorder had firmware, after installing the update I have made several cd's with no problem. Thank you all for all your comments.
I am converting cassettes to cd using real player and a plextor 12/10/32 writer. My problem is that on most (some) cd's a clip is cut off before it finishes and then the next song starts immediately. I suspect that the writer is causing the problem but I thought some one here might have experienced a similar problem and would have a comment.

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