I used to take screen shots very easily on my S2. Now with S4 it is much more difficult. I use ofcourse the same 2 buttons , the On/off and the menu buttons, but it works only every 5 or 6 trials. Also I do not hear a sound, so it is difficult to know that I did take the shot. Is there a way to re-configure the buttons or make them work easily, and hear the sound / Thanks in advance.