Thumbs down [Q] No focus

Hi - I've got a Note3, unrooted.

It's happened twice that it can't focus (unless the thing I'm taking a picture of is ~1cm away from the lens).

The camera 'knows' it's not in focus, you get a red square (unless the thing I'm taking a picture of is ~1cm away from the lens, when I get a green square).

Focus problem exists with stock and FX Zoom app and after clearing camera's cache and data.

I've seen online a couple of people reporting this problem.

I can return it under warranty, but would rather not 'cos I'll lose my slightly expensive screen protector and will be without my phone for a bit.

Thanks, Richard
I like telling people that the stylus in my Note 3 is an aerial, and then acting suprised when it breaks off.