I feel like I'm going crazy. My new ipad mini, which is amazing in so many ways, emits a soft click at random. Usually after a combination of a swipe and a home key press. I cannot find any combination that will trigger the click, but it is definitely triggered by a touch. Whether the volume is up or muted, it stays soft, almost in audible. I really like this thing, but its starting to make me ill. Anyone heard of such behavior?