I have a Cambridge Audio player. While my DVDs play, the machine vibrates, making a strange buzzing sound, which quietens if I press the sides of the machine, but I can hardly remain there doing that. Is this the problem you're referring to? (I have not sighted your earlier posts.) I had wondered if my machine was seeing the end of its days, until I spotted your post just now, and so have double checked, and yes, other DVDs I play are all buzz-free. So it's these two Red Noise discs only. A rather weird thing.
Would you mind letting me know if you have any updates, such as news of replacement discs? Which I figure will be unlikely.

Thankfully, this is a noisy album musically. so I don't hear the buzzing while playing the music. One of the other DVDs I tested, for example, was Giancarlo Era's lovely Departure Tapes - if the buzzing had been present with that one, it would have been very annoying indeed.