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It's either your hotspot or credit card. If all your "purchases" were done through a proxy then that is probably ruled out. Geertm gave nicky added advice about books not all completely downloaded even if it initially looks like it did. BN cancels automatically.
Credit card seems possible, though. The randomness of it. And she also mentioned the small pending charges on credit cards even for free ebooks. Does your credit card company list pending charges on their banking website? A call to your credit card may be helpful, if they're blocking you. I would imagine 20 or so hits to your card would raise a security flag.
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