Analysis on the reason why snapshots are not updated on the midou Homepage

Recently, I suddenly found that the snapshot of the MI bean Web homepage has not been updated for more than 20 days, but the articles are recorded normally and the snapshots of the inner pages are also normal, and the articles are updated almost every day.
I found the following reasons on the Internet:

First, the weight of the website is declining. Baidu has not positioned you in the previous position.

Second, the content of the website has not been updated for a long time, or even has been stopped. Baidu crawlers crawl less times a day.

Third, the content of website articles is basically collected, and the collection is too serious.

Fourth, the website title, website keywords, and website description are frequently modified. Baidu spider feels that you are not ready yet, so your website has become an inspection period.

Fifth, the website has been revised recently, and there are major changes in the header and bottom, which will also cause Baidu snapshot not to be updated.

Sixth, the website's server is unstable and is often inaccessible. In the early morning, the most frequent occurrence of spider attacks. If the site cannot be accessed at this time, snapshots will not be updated for the time being, if you do not have frequent access for a long time, it is possible to be accessed by the K-site.

The comparison between my website and my website is as follows:,. My website has recently changed the subject and modified the website title, keyword, and description.
In addition, it was recently discovered that the server is not stable and often inaccessible. At the beginning, the server was inaccessible at night or could not connect to the database. Later, the server was often inaccessible during the day, in addition, 400 calls were made twice in the evening, and no one answered the call after waiting online for more than half an hour.

At the beginning, the server instability was reflected to the service provider (Shanghai meicang). The service provider began to say that there was no problem and once said that the host was not theirs (I am depressed, people do not recognize it.) later, it was because a website had a problem that dragged the server down. Later, the Hong Kong server was no problem. At my request, the server was completely resolved yesterday, it took me 10 days to solve the problem.
The last chat record was previously contacted by mobile phone QQ