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Thanks mdalby, Carl, and Paul for the comments.
Paul, I can't remember if it was the black uniforms or not. But when the AF wouldn't work, it didn't matter if I point the camera to a different area of the court. I had to turn the manual focus first and then the AF would start again. I tried center point, expanded, and single. I was still having issues now and then from them all. What is frustrating is when it did lock, I loved how sharp it was but I missed more shots near the goal then I expected.