permalinks constantly needs re-saving

When you visit the Permalinks page, the permalinks rules are being flushed. It also forces WordPress to reload them. For this reason, you see the issue go away after saving permalink settings. But after some time, it comes back once again .

Try following these steps:

  • Deactivate all the plugins. Then activate one by one. In this way,
    you can find the plugin that is causing the issue.
  • Try using a different theme. If it fixes the issue, there must be a
    problem with the existing one.
  • Check whether there is any issue in .htaccess file.