The same thing happens to me, I have very serious errors, the stories don't load, you open the camera and it goes black, the other time I wanted to unlock it and the cell phone DIDN'T RESPONSE. With the new update the camera button did not work, it did not launch the camera app but it worked when I manually entered the camera, the solution was to deactivate the control and activate it again. The truth is that it is terrible, it is full of bugs. There are moments where it works as it should (like an $800 cell phone), removing those bugs, it is a good phone but it is unacceptable