im really frustrated right now, for freezing. I did do factory reset and the same thing happens! It just freezes and the IU bubble keep popping up and say "IU system has stopped working" and some other apps said that too. it also say Touchwiz has stopped working too. The IMEI is also null and when I dial *#197328604# service mode appears but nothing is there. And why does it keep restarting by itself? Please help I'm really frustrated. Been working on this for 3 hours already