Magento ver. 2.1.6
Suddenly the one page checkout is not working anymore, the user can not go to the next step after she/he entered a valid address.
I can see in chrome developer network tab that the ajax call, which checks if the email exists in the system, is executed.
But after then, nothing happens anymore. I type in the address, but no ajax call is executed to transfer the address and calculate the shipping costs and so no "proceed checkout" button is shown.
I MUST refresh the browser (ie. press F5) in order to be able to continue.
I know, i did a "Flush Magento Cache" two days ago, but i can not believe that this caused this weird behavior.
Any suggestions are highly appreciated.