使用AJAX排序的jQuery只能每隔一段时间运行一次

I've got a table of fields that have a drag-to-sort handle using jQuery's sortable plugin which in turn fires a PHP script via AJAX to save the changes once a submit button is clicked. However, it only actually works on average every other time. Every once and a while I'll get two successful runs back-to-back but that's pretty rare.I've got a table of fields that have a drag-to-