What does cron error "exit status 4" mean in syslog? (Ubuntu)
Ok, I'm such an idiot sometimes.

I've edited the .htaccess file this morning to redirect without www. to www.domain.com and that has caused my cron going to localhost to be redirected to www.localhost which caused the cron to fail. /facepalm

But to answer exit status 4's meaning for wget according to this page it means Network failure (Kudos to @Clive)