Users can either reload the pages or refresh the outdated and corrupted files when a plain screen appears. Clearing up the cache and removing cookies are also helpful. Here are a few more ways to get rid of the problem:
Caching plugin installed, or you can disable plugins as well. For plugins disabled, you may have to contact your plugin developer.
Enabling debug mode
Clearing up all the browser cache and cookies.
Retracing all the steps.
Getting in touch with the host if nothing seems to work.