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[edited by: Maximum44 at 3:28 pm (utc) on Oct 5, 2016]
joined:Oct 1, 2016
Ad unit style testing by Google is most likely cause for RPM drop - they may have tried some real 'out there' stuff this month - so of which does really well and some really badly.
They will be testing both return for publishers/themselves and return for advertisers, I'd guess.