Hello, This is my first post but I've been a member for few months and have been little bit more active through pm's. I have a question that i can not find an answer to. I have few niche websites, they rank pretty OK, but they have one thing in common. They rank well and then suddenly drop in rankings for no obvious reason(at least to me). When I say drop I mean like from position number 3 to page number 15 or 30 or nowhere to be found. Then usually after few days, sometimes little longer they get back to the same position or even higher, to drop again after few weeks. Interesting thing is that it doesn't matter if I work on links or not, it just happens. Sometimes it happens that instead of the main page dropping 15 pages it almost totally disappears for my main keyword ranking and I find subpages ranking for the particular keyword, however the main page still ranks well for different keywords. By the way the websites are around year long, only white SEO is being implemented and the process of dropping and gaining just keeps repeating. Has anyone experienced something like this? Any info is very appreciated. Thanks.