credit protection for mortgage

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I know this sounds niave but.. when you start buying houses how do you keep your credit score from going down? They check the credit and bam lower score the next time they check. Ive gone from a 760 to 720 in two months by purchasing two homes via credit checks. WTF. so you know diligently managing our spending and bill paying seems to matter not to the credit dept. How do we protect our selves? 8)