I have a htc one x and had some problems with the wifi. I saw a video on youtube that if you put presure right under the camera the wifi signal will be stronger. So far so good. But afer a couple of days it start having some problems.. the screen turns black( but the perfectly works, only the screen doesn't work). The weird think is that i put presure again right under the camera the screen start working again. I've change the display but keep doing the same problem. Some advice ??