civicCRM hangs. Crashes site
Look for error message in civicrm error log 

.../wp-content/plugins/files/civicrm/ConfigAndLog

where you will get more details of the error 

If you don't have any error message in civicrm logs look for PHP error logs where you will find it 

refer: https://wiki.civicrm.org/confluence/display/CRMDOC/Debugging+for+developers

I guess this helps!!!