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as far as I know google updates its search engine results continuously though you may not notice it if your website has been stable in the serps for a long while and the algo doesn't change that dramatically.
but i think it's normal for serps on one's major keywords/keyword phrases to change around a bit. a friend in my town/niche who does well in ranking for his words says he pretty much has been on the first page for years but fluctuates between like #3 and #9 in the serps for many words; he considers that normal and he doesn't worry about it much anymore either.
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