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I saw a similar effect across campaigns. 9 out of 10 dropped, just last week.  Whenever I see that across a number of campaigns, I assume it is one of two things:

1. A simple algorithm tweak for the DA calculation.

2. Google is tuning their main algorithm, it caused real DA impact to sites, and creates a cascading effect across the DA ranks.

The last time I saw this effect was late april early may of this year, right as google was starting to push out the update that they eventually rolled back.  A few months later, I saw the DA ranks all go up to where they were before, again, across 9 campaigns.

I guess the question is, is Google moving again?  Or is Moz simply tuning?

Thanks,

Greg