I have a SP4 (i5, 8GB, 256GB) which I'm very happy with, but which has some issues. The battery problems I can see many have, but I haven't been able to find anyone having the camera issues I have (I'm sorry if I've missed any posts on this, if so please point me in the right direction, thanks). Basically, I am unable to use the rear camera due to it constantly going in and out of focus. It's like it's trying to adjust the focus all the time. It doesn't matter if I touch the screen to focus in a particular place or not, nor does it seem to be app related. Has anyone had a similar problem and been able to solve it? PS. Thanks for all the other good tips on this forum.