Can anyone diagnose this S5 camera/lens issue???

I have just come back from a shoot, during which my Lumix S5 started doing something very odd. When fully zoomed out on my Panasonic 24-105 lens, anything that causes the zoom to move slightly (starting to spin the zoom ring or adjusting the focus) plays absolute havoc with the image. The zoom length starts to jump all over the place and the autofocus driver fires up, going in and out of focus. The camera is set to MANUAL focus. Which is very odd. 

You can see in the video that although the lens zoom is set to 24mm, the camera seems to think its moved to 30mm.

All firmware is up to date. I don't even know where to start with this? Any ideas?



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