Googler Says Site That Keeps Disappearing From Search, But Reappears When You Submit To Indexing Could Be A Quality Issue
https://twitter.comGary Illyes from Google recently tweeted out that if you see a page on a site that keeps disappearing from search, but reappears when you submit to indexing in Search Console. He believes the page is likely very close to, but still above the quality threshold below which Google doesn’t index pages. He also goes on to say that as they find new URLs, the page may fall out the index, but then you breathe new life into it temporarily by submitting to the index manually.