I am getting frequent 400 errors on my site acredogs.com. I hired a tech at Codeable and he identified an Ajax call that was causing problems. It seems related to Woocommerce Cart Refresh Fragments command not working properly, maybe between plugins. And in the Console errors I see a wcml_reset_cart_fragments so I'm wondering if it could be involved with the problem
Here is the forum ticket. Please try to copy your site to a staging site and enable a minimal environment as below and observe the issue again:
- Deactivate all plugins except WooCommerce and WooCommerce Multilingual.
- Switch to a standard theme of WordPress.