If you have encountered "white screen of death", please check your web server log files and see what exactly is this error saying.
There are multiple steps you can take to prevent it:
1. Update your theme to the latest version as well as WordPress core.
2. Disable any 3rd party plugins, see if that solves the problem.
3. Make sure your PHP version is 5.4.40 or greater.
4. If all the previous methods does not solve the problem, open up a ticket with the error message.