Hi Olga
The shipping options came back but there was a strange issue whereby if you tried to update something in the cart (add or remove an item) it would not update unless you refreshed the page.
There was an issue with the AJAX request that caused a 503 error – this is down to some kind of broken php script.
We have ended up having to revert to a backup from last Tues 28th September. The only things updated that day were the Woocommerce version to the latest, and the Xstore theme to the latest version, and Xstore core plugin. So there must be some conflict somewhere.
Is the newest version of the theme from 24th September compatible with the newest version of Woocommerce (5.7.1)?