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do you have expired books on your kobo?
I had problems related to keeping expired books on my kobo (like if one time-based DRM was expired it "infected" all other DRM books), but if I delete them before adding a new book, I haven't had the problem occur.
If you don't "return" or delete your old books before adding new ones, I would definitely give that a try.
I get out lots of library books as well and that seems to have fixed it for me, though I never had to resort to reauthorizing ADE ...actually I'm not even sure of the many things what did the trick back when I was having the problem.
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