Hey, I have a website that is 18 months old, pr3, many non reprocial backlinks and some 'normal' link exchanges with similar themed sites (Though not many, but does include 2 pr5 sites). Anyway, my problem is I seem to have my main page ranked for several terms and then they disappear again, it's been like this for a while, like they will rank on page one for the terms for a week and then disappear for a few weeks and then come back for a week etc etc. Why do they keep coming back only to disappear again? Anyone encountered this? Thnx