My brand new iPhone 5 is having an issue with the mute/ringer switch. When I lightly touch the switch, it goes into silence mode for a brief second, then goes into ringer mode. When I flip the switch over to silent, it buzzes and briefly displayes silent mode before displaying ringer mode. It appears the switch is "activated" by a light touch rather than actually flipping the switch. It appears to only want to stay in ringer mode no matter which way the switch is flipped. Do I have a hardware problem that I need to return my iphone 5 or can this be fixed otherwise?