Driving home from work last Friday, got my ipod plugged in to my USB instead of using my phone for Bluetooth as I usually do. My phone is in the cupholder. All of a sudden this super loud high frequency noise is blaring through my speakers...I pushed just about every button in the car (radio off, volume down, everything) and was about to pull over on the highway to turn off my car and even pull the battery. Then I picked my phone up out of the cupholder and it was done. Dipped my phone into and out of the cupholder and low and behold when it was in the cupholder it created the noise. WTF? Restarted my phone and it didn't happen again. Haven't used my ipod since then, but what could possibly do that?