If you can't pretty quickly "ballpark" the number of items you've returned to Amazon since you've been a customer, I'm guessing it's "too much." Regardless of how much you order.
I don't say that to be rude. I truly believe it. I probably order 50-60 physical things from them each year, and at least that many ebooks (before I switched primarily to epubs). After 7-8 years of that, I recall returning a defective Fire (exchanged for another) and one ebook that was atrociously formatted. That's about it.
I've never once returned anything for "not turning out to be what I wanted," or ever ordered anything with the mindset that I could return it if I didn't like it. I don't judge those who do, I just believe them to be pushing their luck, and very likely to receive the kind of email the OP has.
As long as my returns are for issues and not convenience, I don't ever expect to run afoul of their algorithm.
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