There are many reasons why some online novels stop updating around September 2019. The following are some possible reasons: 1. Termination of copyright: The copyright of some online novels will expire around September 2019. The publishing house or copyright owner will no longer pay the author's royalties or provide update services, causing the author to be unable to continue updating or publishing new chapters. 2. Platform adjustments: Some online novel platforms have been upgraded and adjusted in September 2019, which may cause some authors to be unable to publish new chapters or update the latest content. Some web novelists announced that they would stop writing in September 2019 because they no longer wanted to continue writing the story or because they were unable to continue writing due to poor health or family reasons. 4. Other factors: Some web novels might stop because of other factors such as economic difficulties, political events, natural disasters, etc. The reason why online novels stopped updating was that the situation of each author and platform was different.