My iPhone causes static/scratchy noise in the front left speaker when the iPhone is sending/receiving large amounts of data. The noise is pronounced when the iPhone is in the cubby below the touchscreen, but minimized or eliminated when I am holding the iPhone. The noise occurs even when the speaker is muted. Burlingame SC was not able to fix the issue. Any suggestions? For diagnosis: 5.0 OS, tech, pano, active air, parking sensor, but no sound upgrade, delivered early Sept. 2013.