Hye ... I Use Galaxy 5... but sometimes it's hang and the screen go blank... if i press any button only the backlight shows up... this is the 3rd time i have to open the battery cover and unplug..... and replug the battery for getting it back to normal... i found also 1 times when someone try to call me.. suddently the ringing stop and the phone screen blank... is't software problem? anyone have the same problem?