I'm puzzled - has anyone ever had this problem and managed to get out of it? My website ranks on page 1 for a whole bunch of keywords (including short-tail or head keywords) for approximately 4 days. Then its rankings for these same keywords drop sharply, and stay low, for approximately 4 days. Then they rise for ~4 days, then drop for ~4 days, etc. This cycle has persisted for 5 months now and I want to break it so that rankings return to how they were prior to 5 months ago - that is, consistently high rankings. Has anybody experienced this before? And did you manage to solve the problem? Your help is much appreciated.