content is a >
second, website error changes
first, the server is not stable
fourth, its website optimization over
competition at any time, so the website ranking, without any problems, do a reasonable job every day. But it is likely that your competitors in terms of optimization than myself, (but the keywords ranking decline is very small) other keywords in the rankings and more than us, our natural ranking will fall. In order to keep the rankings, the optimization of every day maintenance work must be in place. Otherwise we might not be back, but others in advance.