HI, my iPad 2 has very harsh sounds - like a loud, distorted woodwind instrument - (apologies to any instrument players) but this is how I can best describe it. Have tried double tapping the home button, turning off etc, but the sound does come back intermittently. Also why does the iPad jump to a previous totally irrelevant search, when the back button is tapped? It rarely returns to the previous page? Thanks for your help.