The CD could indeed be degrading. It could be the data is fading.. i.e. the track burned by the writer isn't like it used to be.. or in photo terms, it's beginning to lose contrast. It's very possible that one CD player is better at reading such a track than another player. This is exactly why Sony car stereo's in the 'old days' had problems reading CD-R media. They had a weaker laser than most which resulted in not enough light being reflected.

So reading the reading problems might just be an indicator of things to come. In other words, find a reader that will read the disc without problems and reburn it freshly. Or store it some other way.

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