I called to Go Daddy and they told me that there is a problem with the update of WordPress 4.4 version. There is some trouble of compatibility between the theme and new version of wordpress or maybe I should check the compatibility of pluggins? By now, I restored the website with the backup of WordPress version 4.3.1 and I will try to update another time the 4.4. version of WordPress.
If you have some idea of this subject, please, tell me.