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Problem:
The client is experiencing random error 500 alerts when changing the language on their website. The hosting provider indicated that the issue is related to the language plugin and the .htaccess file. The error log shows a misconfiguration leading to an excessive number of internal redirects.
Solution:
1. We recommend checking for third-party functionalities that might be causing the issue. You can find detailed steps to identify the problematic component on our FAQ page: https://wpml.org/faq/why-is-htaccess-getting-overwritten-with-the-language-folder-on-my-wpml-website/
2. Create a full site backup.
3. Update the WPML plugins to the latest version (v4.6.15) by navigating to Plugins -> Add new -> Commercial tab.

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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 further assistance is needed, please open a new support ticket at WPML support forum.