Dear Subhash Kumar It depends. The Scopus content coverage can indicated a sudden increase in accepted and published papers for example, which is suspect.
Years of Scopus coverage range from 2000 (before the official launch of the database) to 2024 (editions formed more than a year in advance). It is also worth noting that such materials often are indexed "in advance” as Article in Press.The standards of publication quality are very high, so it is considered prestigious to have an indexed article in these systems. It takes a lot of time for editors and reviewers to check articles for quality. On average, it takes several months for reviewing and several more months for indexing.In conclusion, there are several reasons why journals may be discontinued from Scopus, including lack of quality control measures, decline in article quality or relevance, changes in research focus, and publishing in volume without peer review.
Subhash Kumar Instead of relying on a journal's inclusion in Scopus, I would recommend using either Journal Citations reports (a subscription-based product) or SJR : Scientific Journal Rankings, https://www.scimagojr.com/journalrank.php to determine whether to submit your manuscript to a particular journal. In addition to information about the inclusion of a particular journal in any particular index.