Almost a week ago, the number of visitors from search engines was decreased by 5 times. Meanwhile, I found some code html errors on almost every page and Google webmaster tool found 40 links that are missing. I resolved these problems. The missing links appeared over night and I think from them was the problem. The questions are : Were these errors the real problem or is something else? When should I expect things to return to the beginning?
i am sure that google changed their algorithm for indexing, crawling etc. wait for google index your site as normal. but keep in mind that now google only rank original content.
Many people have problems with google new algorithm. It is changing frequently and many publishers loosing their page rank. Anyway wait untill again google to find your links
not sure if that's the real problem of that decreased, but since you already fixed how about try to observe it..
If you haven't changed your site structure for so long before this errors occur, its the algorithm update that makes your site loose rankings and decrease in traffic. Make pretty good if you make so new update on your site contents and keep it indexed more often by gaining backlinks from well-indexed sites like this forum.
I think it can be the problem for the drastic rank down in Google. To make it ok i think you need to do some SEM to create backlinks which help you to go back on top ranking.Also refer your site content and make it fresh with good amount of keywords.
I guess google is eventually proving their statement slowly and steadily that the PR system will be completely stopped and the SEO will be almost dead within 6 months. Instead of doing it instantly, they are doing it gradually by making some changes in their algorithm. It will be a huge blow if they do it instantly so they are playing a smart and waiting game During this update, every one of us, either lost its PR or completely lost all the pages of their blog/site from google. So many of my own friends in my group were really disappointed for this step taken by google. However dont get disappointed and start again
Do the continuous work on the seo and link building ... it will give you nice trafic and search engine visibility..