Welcome to Android Central! Sounds like a faulty screen. Any recent trauma or water exposure? You'll probably have to send it to Samsung for repair, since it's presumably still under warranty.
Thanks i usualy use apple products but giving the note 4 a go so far i love the phone except for the faulty screen just downloaded an app called Clean Master seems like its done the trick so far
That's interesting--it highlights the potential risk of downloading torrents, since they might come with malware. Glad the screen seems to be working again!