[Resolved] multilingual pages getting 404 errors

We have a multilingual blog website with 7500+ posts. We are using WPML for the multilingual functionality. Also, we use WP Rocket for the caching. The multilingual pages getting 404 errors. Dont know what causing this issue. The site is only cached for visitors and not for logged-in users the logged-in users can access the multilingual pages, but the visitors cant and they getting a 404 page not found issue. This issue is only fixed when permalinks are saved again. but after 1 or 2 days the same issue came again.