Issues when using woocomemrce

Every some time, my woocommerce site (using Cloudflare) get to a point when users can’t make any purchase. Adding new item to cart and then going to the cart - results a “cart empty” page. If I get to the cart through the cart icon - I can see the items but when making a purchase I get a ‘page not found’ (404) error.
The typical solution is to disable Cloudflare for some time (just clearing the cache doesn’t help), then enable it again, and wait for the next time customers complain.
Will appreciate help

A post was split to a new topic: Can’t reach through Cloudflare