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Problem:
The client was experiencing a 503 error in WordPress when using WPML, along with a PHP Fatal error related to the function

get_requested_lang()

. After reinstalling WPML, a new error appeared regarding the premature loading of translations, indicated by the function

_load_textdomain_just_in_time

. Additionally, the client noted slow loading times in the WooCommerce settings when WPML was active.
Solution:
We identified that the issues were not directly caused by WPML but were related to the latest changes in the WordPress core and possibly other third-party plugins or themes. We recommended the following steps:
1. Check the errata page for known issues: https://wpml.org/errata/php-error-wp-6-7-notice-function-_load_textdomain_just_in_time-was-called/
2. Re-upload the WPML plugin to ensure all files are correctly installed.
3. Create a full site backup before making any changes.
4. If the problem persists, we recommended opening a new support ticket for further assistance.

Please note that this solution might be outdated or not applicable to your specific case.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 persists, please open a new support ticket at WPML support forum.