Thanks for your advices. The matter remains mysterious.
Scratches and or fingerprints or other physical damage are not the cause. The problem arose especially with a series of Sony CDRs which I burnt on a friend's PC and tried to play on my players, but also with a number of different CDR brands burnt and later played on my equipment, and with SOME but not all factory pressed official CDs: played fine ONCE on mine, then never again. Some get corrupted later (suddenly after many times playing - just like back in days when we had vinyl).
I don't suspect that the reading laser DESTROYS data necessarily, it's rather the idea that it may add a tiny piece of data which corrupts the CDR. Odd is also that these corrupted CDRs play fine always on another friend's equipment. When he eventually rips a copy for me (onto imation), then this imation CDR rip is ok on my equipment.
After all observations, I cannot but conclude that a reading laser burns some information on CDs and confuses some (my) CD players. Whether this is an addition or deletion - I don't know.
One of the consequences would be that a backup has to be made of all media
Or simply never play the stuff meticulously recorded ...
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