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There are several reasons why CSS and JS files may not be loading on a Symfony website during production. Here are some solutions you can try:

1. Clear cache: Sometimes, the cache may prevent the CSS and JS files from loading properly. Clearing the cache may fix the issue. You can run the following command in the terminal:

php bin/console cache:clear --env=prod --no-debug

1. Check file paths: Ensure that the file paths to the CSS and JS files are correct. Make sure that the file path in the HTML code matches the file path on the server.

2. Check permissions: Make sure that the web server has the proper permissions to access the CSS and JS files. Check the permissions on the files and directories and adjust them accordingly.

3. Check server configurations: Check the server configurations and ensure that the necessary settings are enabled, such as the mod_rewrite module in Apache.

4. Combine and minify files: Combining and minifying CSS and JS files can enhance performance and fix issues with loading times. You can use Symfony's built-in Assetic bundle for this purpose.

If none of these solutions work, you may need to consult a Symfony developer or seek further assistance from the Symfony community.