[Resolved] Product Category page is Going to 404 Error page.

Problem:
You are experiencing issues where your product category pages in Greek usually work fine, but sometimes redirect to a 404 error page. In English, most of the category pages often go to a 404 page. Refreshing the permalinks temporarily resolves the issue, allowing the pages to open correctly once.
Solution:
We recommend that you first try to resave your permalink settings. Go to your WordPress dashboard, navigate to Settings > Permalinks, and simply click 'Save Changes' without altering anything. This action often resolves issues related to unexpected 404 errors on multilingual sites.
If the problem persists, it might be due to a compatibility issue with another plugin or the theme you are using. In such cases, we suggest performing a conflict test. Disable all other plugins except WPML and switch to a default theme like Twenty Twenty-One to see if the issue still occurs. If this resolves the problem, reactivate your plugins and theme one by one to identify the culprit.
Please note that the solution provided might be outdated or not applicable to your specific case.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 for further assistance.