iPhone freezing daily
My iPhone 6S Plus has been freezing since the day I got it. Just randomly while doing something on it, it will freeze and won't respond. The only thing I can get it to do is lock, but once it locks it stays at a black screen until I force restart it. I asked apple about it a while back, but they just kept telling me to restore my iPhone, I tried it once and it didn't help. I am about to try it again right now.
Has anyone else had this problem or found a way to fix it?
iPhone 6s Plus, iOS 9.3.1