Hi Guys, I had this problem since 3 months from now. I tried pressing on the bottom portion of the rear camera, but it did not work for me.
Today morning I just unscrewed the rear panel and pressed on the connecting chip which is on the right side of the camera (When we face rear camera). Unscrewing may make your warranty void, but that is ok for as I don't have service centres near my place.
Anyway if you don't want to remove the rear panel, try pressing on the right side of the camera (Remove the rear cover which means you can see the battery and sim cards when you doing that. Pressing on the back cover will not do much help). It MAY work.
Thanks
Godson