Iphone6 plus automatically turn off (frequently)and cannot use WIFI

Question

Just bought Iphone6 Plus 16GB Gold on 15 Dec 2014 from The Australian official Apple website.
In this week, my phone turn it off automatically (very frequent, it seems like if i not use my phone, it will shut down)
and cannot normally turn on the phone, i can only turn it on through HOME BUTTON + TURN ON/OFF BUTTON.
And after i turn on the phone, the WIFI button become GREY COLOR, which means i cannot use WIFI, cannot turn on/off.
And i try to restore setting from the phone and also from iTunes through computer, it doesn't help.
Does anybody know what happen to my phone?

Answer 1

hi，
so can I ask how do you solve this problem？
在 2015年1月10日，08:39，Apple Support Communities Updates <[email protected]> 写道：
You received a reply
coolbeanz has replied to your question. You can view the full discussion in Apple Support Communities.
Iphone6 plus automatically turn off (frequently)and cannot use WIFI                                                                            
I have this same problem, but with an iPhone 6, 16GB Gold
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