Try checking what's in the logs.
You can activate 'Developer tools' plugin and enable 'Error log' option. Then repeat the update process and see what's in the logs yourapp/admin/develop_tools/error_log
Also look in your browser's console via DevTools (Inspect, or Ctrl+Shift+I).
There may also be error information there.
Thanks. It has been solved by hosting service. When I asked what the problem was, they said that The relevant situation had occurred due to heavy PHP usage. There might be areas in my software that I need to optimize. And added they recommend that you have a professional webmaster or software developer review it.
info@elgg.org
Security issues should be reported to security@elgg.org!
©2014 the Elgg Foundation
Elgg is a registered trademark of Thematic Networks.
Cover image by Raül Utrera is used under Creative Commons license.
Icons by Flaticon and FontAwesome.