I had my Hero plugged into my car stereo via the headphone jack playing some tunage, and all of the sudden it started playing this high-pitched squeal noise while playing the music. I unplugged the cable, and then plugged it back in, and it went away... for a while. It came back later, so I tried my "fix" again. It seemed to work, but not for as long. I'm rooted running CM6.1. Has anyone had this problem before? It also happened on my home stereo with Pandora, but I couldn't get it to go away by unplugging and plugging back in. Thanks.