A stuck pixel on the LCD is quite common. I have one on my 2020z; lot of people here would tell you the same thing. Long as it's just one, I wouldn't bother trying to get new camera. Far as the lens extension sound: It is a little loud, but a *grinding noise* doesn't sound normal. Go to a store and pick up another one, see if it makes the same sound. If not, you may have a bad camera.
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