When trying to editing a content on IE 10 or 11, there is a IE error message (cf.Capture)

La connexion avec le serveur a été perdue mais le serveur est peut-être toujours en train de traiter votre requête.

The message is followed by a lot of errors (between 50 and 100) as connection with server was lost (cf. Capture 2)

The content contains a lot of tabs, fieldsets, repeaters, select content widget, ...