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Maybe there is another dc out there that we don't know about yet and you're occasionally getting those serps. Otherwise, I don't know. Sometimes you'll get everflux rippling through different dc's but it doesn't sound like it if you're checking all the known ones...
I doubt if it has anything to do with another algo change, but you never know.
It seems like it is restricted to the more competitive terms, but it was across multiple DCs that I spot checked. Since Friday I've noticed 9mil results to 5mil, 6mil to 3.7mil, etc. - iterating at least three times - before settling back to the higher total results this morning.
While most of my post-Florida problems have been commerce sites, I also just lost two news/information sites over the weekend. [same symptoms - index is gone with their primary search terms, but linked articles still come up on top in as much as 3.9mil total results].
-The good news is that such a dramatic shift would indicate G is still not finished.
<update> The total results just dropped again on www. Right now, it appears to be coming from -in and -gv. </update>
The strange thing is, on all the DC's my site is still #3. All the sub-categories I am monitoring have remained unaffected. This has me totally stumped.