My 3rd water pump. . .?

I have a 2004 Toyota Corolla which I have maintained well. I had to replace the water pump last summer for the first time. 2 weeks later, the new one blitzed and had to replace it again. I took the car in yesterday for a recall and the dealership told me this water pump was leaking now. What gives? Is it faulty parts? Another internal issue? What do you think?