hi @scottsonline, can you confirm that you see it, too?
i see it on multiple domains in different verticals, hosted on different domains, different networks with different codes-bases.
it started between 4:00 and 4:30 european time zone. before this total drop (up to minus 98%) there was a periode of medium activity (but not that unusual) .
a first cool step would be that we confirm multiple sightings of the same phenomenon so the we can exclude single site penalties.