my iphone randomly keeps shutting off
the problem started when my iphone 6 without any reason turned off, i did a hard reset and it worked perfectly.
after that day i woke up finding my iphone 6 turned off. i tried a hard reset but it didn't work.. so i had to " restore iphone " from itunes. it worked.
but still my iphone turned off without any reason and it won't work unless i do a hard reset!!!!
any idea what's going on?!
iPhone 6, iOS 9.0.2