About 5 times now, when I double tap the home button to open the camera, the phone vibrates and the viewfinder "distorts". By distorts, the best way I can describe it, is think of the surface of a lake and a slight breeze creating tiny waves. This lasts for about 3 to 8 seconds and then all is fine. Or, if I don't want to wait, I can go home and come back to the camera. Also there seems to be a slight audio tone like a "hmmmmmm" but I can't tell if it's actual audio out of the speaker or from the material of the phone because of the vibrating. Has anyone else experienced this? I'm a little nervous, because although it has only happened about 5 times, this just started 3 days ago and it seems to be happening more frequently.