I've got the KO2 (32GB) with approximately 5,000 books on it. I organize all of these books into about 10 collections (use genres as my collections). Based on the type of books I typically read, some of these collections are much bigger than rest (for example, I'm approaching almost 1,000 books in my Mystery-Thriller-Suspense collection).
For several reasons I've decided not to jailbreak my Kindle, even though collection management is supposed to be much easier on a JB Kindle. Not sure if it's a "feature" or a "bug", but I've noticed that once any collection reaches approximately 900 or so books it stops allowing the addition of any more books to that collection. Is this normal behavior? If this is normal behavior, and something that must be "lived with" on an unjailbroken Kindle, are there any creative ideas for breaking up a large collection into smaller collections?