SONY NEX-5N E-MOUNT 18-55mm Lens problem

My 18-55mm Lens encounter problem right out of box. My other SONY 16mm E mount lens works fine. It is not occurring right away but happening all the times. If you take a look at 9:51, this lens recognize problem is re-occurring without any physical changes to the camera. My 18-55mm lens is useless. I bought my SONY NEX-5N last year Sept. 2011, but I had to send it for service twice already. I do not recommend buying the camera from SONY when they are first batch. Wait for few months.