Hi every one. Good day for all... I am developing on magento 2.1.3 and get a problem. - Add a product o cart. - Close browser (i use chrome). wait about 2 - 3 min. - Then, turn on again browser. - Go to checkout page (this time it is still working fine). Then go to checkout page again or go to shopping cart, this time these pages notify no items in cart (empty cart). Although mini cart still showing item - I turn off full page cache. It work fine again. But client don't want turn off full page cache.