Perhaps you're burning at maximum speed, which often tends to produce a burned disc that becomes increasingly more difficult to read towards the end.
Try burning your CD-R discs at a reasonable burning speed somewhere from 16x to 32x. For your drive I'd suggest burning at 16x for the best possible result when burning in Audio CD format.
And please use paragraphs for your posts in the future, or some people may give up reading your post altogether.
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