gouri - 2:15 am on May 7, 2013 (gmt 0)
How many positions are the bounces?
I've seen from "small" (1 to 5 places) to "all over the place" (gone from the SERPs, then back and forth between pages, then different positions on the same page).
Is the amount of movement related to the amount of over optimization on the page and/or site? The more over optimization there is, the more movement there will be.