What's the reason for the site being down right?

Now Baidu bid promotion change too big, many brothers said http://www.aliyun.com/zixun/aggregation/9322.html "> site down Right what don't know why,   The following small head bidding software for us to clean up some of the reasons for the right and disposal of the way: 1, the main keyword ranking lower; for example, the original key words in the home page, now Russia fell to dozens of pages may not find the ranking;   2, the site snapshot does not update or snapshot date long ago; 3, the number of entries decreased, no new input page put out 4, many long tail keyword ranking down 5, PR lower 6, spider crawl amount of reduction this is a number of common right to determine the way, then how to deal with the right to drop the question?   I think that to deal with is not difficult, difficult to insist, perseverance is the best way to solve questions and perfect questions. 1, find the reason for the right to be down, such as optimization, server instability, replace the title, change the keyword, etc. 2, to find out why, to prevent another violation of the operation, the content above the importance of a certain initiative, the chain of daily security updates, adhere to, gradually regain weight