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I doubt anyone has a grudge.. Just some script kiddie that has found a new exploit or something like that.. doesn't take any real skill to do but the kiddies get to feel all mighty for about 5 minutes..
Same thing happened to me a few years ago. I had one security setting I overlooked and bam.
Will just has to figure out how to they are getting in and close the door. Should be easy enough to find out by the logs.