Snapshot noise during video with AW100

[SandyW]

I uploaded a 1 second video clip to demonstrate the problem (so you can hear the noise). Unfortunately it would only allow me to upload as a zip file.

Basically what happens is intermittently while I'm recording video the camera seems like it is taking a picture. The screen goes dark for 1 frame and it makes a sound like it's snapping a picture. I am not placing my finger anywhere near the shutter when this is happening. Does anyone know why this is happening?