tedster - 7:30 am on Sep 12, 2012 (gmt 0)

Long tail queries with => 3 keywords are missinterpreted by google or they ignore one keyword or they replace one or two keywords with "similar" but unrelated synonyms.

I've also been seeing this in recent months - but not as long as people have been reporting zombie traffic, not by a long way. However, it certainly could be another factor that makes traffic a lot less targeted.

Does this kind of keyword peculiarity start as zombie traffic starts up and then disappear when converting traffic is arriving again?

We see exact the same and to the same time

Are you in the same time zone so the changes match up hour by hour? Or is it the same at local time, wherever your are located? Or do you mean you see it on the same days?

If sites are all affected in the same time patterns, that would be VERY significant, as I see it. We have not been able to establish that as a fact so far, even though we've been discussing this topic for 4 years!