Analysis domain site is not the first reason

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As an SEO staff, every day to the unit after the thing to do is to site a website, and then domain site, to see their own station snapshots and included as well as the chain changes, and then according to these changes to develop the day's work plan. Five days ago in the morning, I have a site to find a snapshot of yesterday, the amount has not changed, the site is the first, but when I domain site, but found that the site is not in the first place, my heart a surprise: is the site down right? But there's nothing unusual about site? So I hastened to search the internet about domain not in the first place of information, through the online data combined with their own site, I summed up my site domain not in the first few reasons and remedial measures:

A Web site is unstable. Recently, our site is quite unstable space, often the site is not open or open the speed is very slow, which to a certain extent, the impact of the search engine on the friendly impression of the site;

The external chain of the two websites has been decreasing. Through the data analysis of these days Web site, found that the chain has been in the reduction of the State, because I was just taking over the site time is not long, outside the chain has not been fully grasped, but the chain will definitely cause the search engine on the site's suspicion;

There are some dead links in the three stations. Take over this time of the website, has been groping the various situations of the website, the website dead link has not been solved in time, has brought the negative influence to the website;

For these reasons, I have taken the following remedial measures:

At any time to communicate with the space business, once the site can not open or open the speed of slow to let them solve, but also think if the situation in a few days or so, consider changing space;

Second, the stability of the increase of some high-quality outside the chain to maintain the stability of the chain;

Three dead links in the station to remove, will not be removed in the robots inside the shield it.

Although these remedial measures, but now the domain site is not in the first place, even the first few pages can not find! I'm starting to wonder if I've analyzed the error? Do not know domain is not the first page of the situation you have not met, welcome to give me a guide to the maze, my station http:// Www.js678.com, please help me analyze, the bottom is what causes domain can not find the home page of the situation? Thank you!