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No,
I have not made any changes in past 2 weeks. 
But I am worried all my metrics are increasing for all of the page. 
Page Authority has decreased for a particular page only.

My Page Authority Has been decrease from 31 to 24 in a week while my DA has increased from 38 to 39.I have checked all my latest link but didn't found any spamy links.Please help me .Whether this is a update or something else