Why would my water pump fail after 83,000 miles? This is the second mazda that I've had this happen.

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My check engine light came on at 83,000 miles. A diagnostic code indicated that it was the cam shaft sensor. Once they took a better look at things they thought it was a head gasket issue. It was finally resolved as a water pump problem. The antifreeze had leaked into the oil reservoir and the oil level was too high and had a milky appearance. I had a mazda previously and at 120,000 the engine seized on my way to work. I've heard (just recently and too late) that the location of the water pump, relevant to the timing chain is a problem.