Sounds like a strange issue. I was going to suggest a faulty player as a common denominator, but then you mentioned that you have heard the same click/pop between the car and home? Even if something has scratched many of your discs (like a faulty CD disc cleaner or something), I would suspect different players would handle the scratches differently. Doesn't seem to make any sense to me? Sorry.

-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/