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Problem:
The client is experiencing sporadic issues with translating slugs within URLs on their website, where slugs appear in the secondary language instead of the main language and vice versa. The issue seems to resolve itself, suggesting a potential cache problem.
Solution:
We recommend the following steps when the issue occurs again:
1. Re-save the permalink structure.
2. Flush the cache memory.
3. Go to WPML -> Support -> 'troubleshooting' link and click on 'Clear the Cache in WPML', 'Fix element_type collation', and 'Set language information' buttons as described in this link.
4. Activate the WordPress debug mode as described in this guide and check for any error messages in the debug.log file.
5. If the issue persists, consider creating a staging site with a copy of the live site, leaving only the WPML and WooCommerce plugins to double-check if the issue appears again.

If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues here, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If needed, please open a new support ticket here for further assistance.