I've noticed some strange things like this in the past also. Sometimes I get some great top results, then a few days later, or maybe a few weeks later, it drops entirely. Nowhere to be found in the listings.
I read somewhere that Google is now weighing "Time On Site" as a factor in position. Apparently to indicate that if they don't stay long, it isn't worth going to. Hard to say really, but I have also noticed an increase in secondary / alternative search engine traffic lately. Lycos, Yahoo, Excite, Dogpile, Bing and so on have been picking up.
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