To be more specific, song A has artwork from album A, but somewhere along the line it'll change to artwork from album S. This used to happen to me very infrequently, but today I swear its happened on two or three tracks. I don't think its iTunes because I always notice it on the iPod. I am 100% certain this nothing I have done accidentally in iTunes as it'll only affect one track off an entire album.
Anyone else have this happen to them? Its very inconvenient to fix, as I'd have to make a note of the affected track.