one month ago, I was making at least one sale a day with this vendor's product. then, without any traffic change, the sales stopped. No sales for three weeks. I'm suspicious for nature, so I've created a new hoplink from the marketplace, and... BOOM, three sales in two days. Then the sales stopped again for two weeks. Now, I've changed the hoplink again, and in three hours I've already made a sale. What the hell is happening?