Polylang Plugin Causing 404 Errors After Page Updates or after a while

every one or 2 days my client calls about 404 error for some reason all pages become 404 especially the cart page, i resave links in polylang setting it works for 2-3 days then repeate…

same as this thread: https://www.reddit.com/r/Wordpress/comments/181hnpm/polylang_plugin_causing_404_errors_after_page/