Hi, just wanna seek for some help:
Just bought a new s4 I9500 3 weeks ago, but it keep freeze and auto restart, send to samsung service center few days after bought it, they just update firmware and factory reset. After bring back, camera got line and still auto restart, bring it back for 2nd time, then samsung service center upgrade the OS to 4.2.2 and claim it should solve the problem..but then, still having the same problem, bring it back to service center for 3rd time, they just know factory reset and do nothing.

Try to contact samsung service center HQ and request exchange for new devices, and they wanna me leave the phone for 1 month to let them inspect first.

Any suggestion? really piss off with it.

I send in my phone twice, but they just know upgrade firmware, OS and factory reset...very frustrated.