|is what I assume that your CD's source is all about. So it could be in deed a problem having used the 'original' master tape (analogue) which might have had a slight problem, stretched, or issues with the equipment speed (slight speed wobble) when the a new digital conversion for the new digital master was carried out.|
I have the odd 'Original-Image Bit-Processing' Digital Recording DG CD -- BUT this would not be susceptible to what could be the case with an analogue master of what you are relating.
However, those digital recordings have their own problems with a stupidly over-done 'treble-resolution' so it may sound 'marvellous' on some rubbish plastic boom-box. Since so many people have bough such cheap crap audio over the last 10-15 years, it might just be that DG thought they have to suit the prevailing market 'requirements'.
You would know if my notion on this 'wanting' re-mastering is correct, ALL of these CDs would show the same problem. So, if someone of your site-posters has it as well, he then might be able to confirm that it's a re-mastering issue and not your own 'audio processor' having gone coo-coo.