Can the O.P. tell us approx how many books they checked out from KU during the month in question? They should be listed in your KU history. Then we will have some idea of what this "invisible limit" is.
I personally have had a month or two during my KU trial membership where I checked out maybe 35 books during a month (always subject to the "only 10 at one time" published limit). What I was doing was getting a bunch of books to my reader so I could peruse them in batches offline at my leisure to see which ones might be worth purchasing. My intent was never to read them - well, maybe a few of them - but instead I was wanting to filter through them quickly (while offline) to see if there was much of anything that would make me want to pay the normal price for KU, or to purchase the book outright (sadly, the answer to that was "no" for me).
But none-the-less, I didn't trigger any limits at the "about 35 books per month" threshold. I certainly can't actually read that fast, I was just skimming/filtering, but I suppose there are people who might be able to actually read the books and manage that kind of throughput. I figured my skimming/filtering was what many people might do during a KU trial membership. After all, the trial is to determine if KU is right for you, not to trial if you can actually read a book. I did end up reading a few of the books during my trial, but the majority of them were "skim and return".
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