My iPhone 5s started vibrating crazily for no reason. I hit the power button and then it just restarted. It is fairly new, not old

My iPhone 5s started vibrating crazily for no reason. I hit the power button and then it just restarted. It is fairly new, not old

Its either a notification or alarm on vibrate to let you know(check out settings for your notifications n alarms) or try removing sd card n put bsck on