Has anyone experienced a problem with the vibration on the 6+ ? My phone is only 24 hours old and it still vibrates, but no where near where it was yesterday. I heard a crack when I put the case on earlier today. Could that be a problem? I'm really pissed off! Will a factory reset fix it? I assume it's a hardware issue? It's an unlocked T-Mobile phone so I'm sure it will be a while to get a new one if I have to. Very upset.