Is There a New Type of eBook Piracy?

Over the last week I've noticed something that has me really concerned. My titles are selling. And then they're being returned. I've been indie publishing for about 2 years now. I can count on three fingers the number of returns I've had of my ebooks over that period of time.

Over the last 2 days I've had 8.

Okay, I know that's not a lot in the overall scheme, but I think it's a pattern. Amazon