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Tom, Your use of Moz is unrelated to the drop in DA/PA. There have been some recent changes that Rand addresses in this thread: https://moz.com/community/q/is-everybody-seeing-da-pa-drops-after-last-moz-api-update#reply_359883 For an overall explanation of fluctuations, try this link: https://moz.com/community/q/da-pa-fluctuations-how-to-interpret-apply-understand-these-ml-based-scores Have a great day, Matt