I'd say I was about 2 to 3 metres away from the subject. It was an indoor shot. Auto would give me the red square, manually moving it to that point would give me the red square. Move it a little bit from that point I'd get green (sometimes going back to where I got the red one would give green). It seems to randomly through out a red square (I think I'm correct in saying there've been other situations where it's done it). I tap > wait for square > shoot, but sometimes the red square is thrown up so I have to start again
Maybe it's just bad lighting. One of the shots I was trying to get it to focus between to things and it was dark between the two