A strange issue occurred in my site https://myagiaparaskevi.gr/ suddenly. I've done no changes except publishing new articles. Every time I try to visit an article I get 'This page doesn't work'. After 3 or 4 times refreshing it finally opens. The same with some menu items. Note that not all of them have this behaviour. Any ideas?
EDIT: Problem solved: it was caused by an article with bad format (not formatted/filtered text)...