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It's not possible to tell with the info you provided. But I tend to doubt that you would be zeroed out just for duping a page on a bunch of domains.
My first guess is that your server was down when googlebot went thru.
I hear lot's of 4s turned to 3s. I have a batch myself, mostly inner pages without a lot of link support. I guess this is one of google's "devalueing" updates.
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