Game freeze while I click Gui texture loadlevel to change scene

The game work fine.When I direct build on my testing android device, but when I publish on Google play and download it.I click the play button to switch the scene form menu to game it will freeze. The sound also doesn't work. Can't figure out why.It work fine when I publish the single game scene,But without sound either. Wonder why this situation will happen.

     void OnFirstTouchBegin(){
         switch (buttonnum) {
         case 1:
             Transformscene=true;
             SoundSorce.SendMessage("Playbutton");
             Application.LoadLevel("Startscene");
             break;
         case 2:
             SoundSorce.SendMessage("Playbutton");
             menumove=!menumove;
             break;
         }
     }