Weirdest Google Dance Ever!

OK, to be honest I've experienced quite a number of Google dances in my websites. Mainly due to a large number of backlinks... but of course, they return to their SERPs later.

But I have one particular website that is odd...
It was in the first SERP - first position a few months ago. Suddenly it disappeared and I realize it went to 400+ position (I was building a steady number of backlinks then).
I waited for nearly 1-2 months then it returned to the first SERP - but in the 4-5th position. Still, I was getting targeted traffic and had several sales within the first day on its return.

But unfortunately a few days later, it disappeared and went back to its 400+ position. This time I was pissed so I edited my site a little. A few days later it went back to the first SERP.
THEN after a few days later, it AGAIN fall back to the 400+ position.
I edit the site once again and it went back to the first SERP. And fucked-uply, it went fall back after a few days.


Anyone experience this or have a solution to this crap?

Editing it will make it drop out for 2-14 days. You don't have any dynamic content generation on the ranking pages do you. Like meta descriptions or titles that change automatically?