Problem: You are experiencing an intermittent 500 Internal Server Error on your site when switching pages or changing languages. The error clears upon refreshing the page. You suspect it might be related to a cache synchronization conflict, database query locks, or WPML string translation behavior during language routing. Solution: We recommend checking if your server configuration might be causing the issue. Although you mentioned your server as SiteGround with NGINX, it appears you might actually be running on an Apache server. This could lead to a specific known issue where the .htaccess file gets incorrectly overwritten. Please apply the workaround by adding the following code to your theme’s functions.php file:
/* Insert the code snippet here */
After adding the code, please test your site again. If the problem persists, it might be due to another cause.
Please note that this solution might be outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue continues, please open a new support ticket at WPML support forum for further assistance.
