I purchased my D4 almost a year ago and I'm starting to notice something I never saw before. I shoot a lot of sports and last night I shot a college baseball game and noticed when I shoot a burst of images 4 or 5, the first image is brighter than the other. I can notice the others are somewhat darker. I am shooting at ISO 4000, 1/1000sec at 2.8 with WB at 4000K. I'm not sure whats causing this. I sure could use some help.