QUOTE(tigerporc @ Feb 23 2014, 10:28 AM)
Well, I just lived with the random reboots, maybe twice or so a month (normally happens at night during charging so when I wake up, will see the SIM PIN lock) ... then if I remember correctly within 3 months, suddenly started freezing/hanging (tried to fix it during the weekend flashing all the versions of stock ROM - no joy). Freezes without 10 minutes of using any apps that uses WiFi (actually any app, but apps using WiFi freezes it fastest) Had to send it in for warranty. The motherboard got replaced to a new one without the insane chip.
Full story click the warranty replacement link in my siggy.
But mtxx suggesting bout the battery is the easiest explanation I suppose

Buy his batteries to test?
That sim region lock thing is really Samsung's plan to prevent grey/parallel imports and does not work properly too. (It is the NOT the US sim carrier lock, that one is straightforward - after contract period over, can request the unlock to be done by the carrier)
I did not simply assume is battery problem hoping U buy my battery.
But if you already try clean install, then should be battery issue.
My friend note 1 and s2 also have weird reboot.
I help them factory reset but still same. They bought new battery from Brotan, then no longer have random reboot.
Brotan from garage sales sells good battery.
Rm 39 if not mistaken, but no NFC.
This post has been edited by mtxx: Feb 23 2014, 11:57 AM