I can’t see how road debris could be the cause. One blade had a clean hole where a piece of plastic about the size of half a playing card used to be. The rest of the carnage shows irregular tearing and gouging.
I had one once that was cracking on the blade. Got rid of it presto. It was also a black one. Those might have a defect or something. The white one on my old 02 lasted it's whole life.