The sandbox effect or (site getting banned on google) has been prevalent in google for quite a long time, and many websites are falling victim to it.

Whether deliberately or accidentally, these websites get caught by so called (GOOGLE POLICE CRAWLER) and in a similar fashion your site domain goes to a prison cell. While staying in this prison cell for 2-3 or maybe 4 months, google police crawlers revisit the cell to check the status of the website domain.

If the site webmaster or whosoever handling the site notices that the site is not showing on google or any other search engine, and manages to pin point the defect in the site, your website gets back to life, otherwise your site gets life imprisonment for rest of its life, and no one can bring it back, unless you are a hacker and go inside google database to modify your site details.

Normally people ignore POLICE CRAWLER