I have had this phone from launch never dropped or wet. A couple of weeks ago I noticed the outer screen getting unresponsive some times. 2 days ago I started randomly getting this pixelated screen and today the screen went out completely for about 30 minutes. Samsung referred me to UbreakitIfixit for warranty work. The phone is barely 3 months old why not just replace the phone entirely?
Looks like we have the same issue!! Mine also lost its wifi capability. Phone was never damaged on my end. Its in for repairs right now. I imagine it will be warranty since its not due to any damage.