another thing i've seen move CDs around, this is more data discs, you know those double or quad CD packs you get for software? if any static charge builds up between the two discs, if one of them moves, the other moves in opposition, i've actually seen all 4 discs move as a result of taking a disc out of one of those kinds of cases, after seeing that, i moved to CD folders to prevent any potential for damage
as far as repair, i thought of this earlier but didn't post it, a lot of used video game stores will offer cd restoration services, because they usually have a big commerical reparing machine (at least one of the ones here does) so they can buy scrapped up games and fix them to nearly new condition, so that might be worth it to restore your favorite disc (iirc its only like $0.50/disc here, might've gone up a little, its still far cheaper than buying new discs, especially if its a multi-disc set and only one is damaged) just take in something trivial and see if they do a good job, and if they do, might be worth a try
i've never heard of using brasso to fix CDs though, doesn't it eat right through them like it eats right through everything else?