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Out of curiosity, do you use AF-C in these situations?
I'm always in AF-S, but my understanding is that AF-C and AF-S on the Nex 7 only differ in that in AF-C the camera will continue to focus even though the shutter is pressed half way. Unless I'm in MF mode, the Nex 7 continuously focuses no matter how I set the camera, so no need for me to go into AF-C.
With my DSLRs, I have always set the camera to AF only when I'm pressing the AF-ON button. The only way I've figured out to control the AF on my NEX 7 is to either be in AF-S mode and half press the shutter to stop focusing or to be in MF mode, set my AF/MF button to hold and then when I press the AF/MF button, the camera will AF and when I don't press, AF is not engaged.