iPhone 6 will start to vibrate at random times.
It has only happened a couple of times. The phone will be on silent, vibrate set on. The phone will suddenly start to vibrate randomly all on its own without any notifications or calls. Its like the vibrate has been suddenly turned on and it doesn't stop unless I hit the home button or I have "tapped" the unit with my hands. it then stops. What is going on?
iPhone 6, iOS 8