To all of you talking about motherboard replacement WATCH OUT!!
They are replacing your motherboard with refurbished - reconditioned - USED ones so ask them to put new mobos.(ask them if motherboard is refurbished or new)
By replacing the motherboard they are also CHANGING THE IMEI so if you have plans for reselling it know that if i was a buyer I wouldn't buy it with a different IMEI from what is written on the box.
Also if 15 DAYS haven't passed from day of purchase you might be eligible for device replacement NO QUESTION ASKED. (at least thats how it is in Europe)
Dont make these suckers in Asus any favors and ask what is your right as a buyer to ask.
Mine had problem from start with microphone, spoke with support after 15 days and they replaced my mobo with a used one and problem is still there. I'm talking with shop I bought it from to get my money back the next few days.
YOU ARE A BUYER ITS THEIR RESPONSIBILITY TO CHECK THOSE THINGS BEFORE SELLING THEIR PHONE. DEMAND YOUR RIGHTS