Camera button not auto focusing?

[Boomwaller]

When using the camera button on the L920 I press it half way down and nothing happens. If I press the button fully it takes pictures just fine, but does not auto focus anyone else with this?

 

[pbn48]

Mine has started to do the same sort of thing after working fine for the first week. It will auto focus for a split second, then go out of focus and the result is a blurred picture. I do however notice that so far it only happens when I am pointing the camera downwards - as if I was photographing my feet. It doesn't happen with my wife's lumia. Any one got a solution ?