I have seen this many times but lately I am seeing it more extended lengths of time. I am working on building back links. I do all of mine manually and really only a few at a time on sites with little to no back links. Google places us high up on the first page and then we disappear. I am used to this in the past but with in a few days I would reappear now it seems to be disappearing for weeks at a time. Anyone else notice this?? any ideas?