I am having the exact same problem. The camera won't hold focus. After maybe 20 taps and a lot of luck, I can get it to focus for a few photos, then the focus is lost again. The video... the same story.
The camera is also causing my phone to overheat. i have had to turn it off, because the big circle were the camera lens and the flash are, become over heated.
The last issue I have encountered is that my text message threads become "read only". I have to start a brand new thread to continue texting a person.
I absolutely love my phone, and I bought it specifically for the camera. No other phone comes close. I do not want to get a new one, but if my camera doesn't work, what is the point. What is the fix for it?