I have found that our website is out of order – header and footer do not appear on all pages. Last order we have received yesterday 15:45 – it should be working, because without it it should not be possible to access checkout. I do not thing that there was any WordPress update. Plugins were not updated as well as I update them manually. Anyway I tried to update needed and to switch off plugins, but it did not solve the problem. I have not modified anything on the site last few day.