I've had this phone for a couple of weeks now, but today was my first real trip using navigation. I have an audio headset jack in my truck and used to stream music and use my navigation at the same time, with both my Droid and Droid X. I have never experienced any engine noise/feedback when I had them plugged into the charger. Today, my rezound is really kicking back this crazy feedback and it's not just with the Navigation. I also notice it when the phone is playing any audio. Note: This only happens with the audio jack plugged into the phone AND the charger at the same time. To describe it; It is an absolutely annoying high pitched and constant whine. It gets louder and softer with the RPMs. I called VZW and HTC to see if they've had complaints of this same issue. Both of them claim that they've had no reports of this "feedback while charging issue". Both claimed that they are aware of a audio glitch that happens while streaming music, but nothing near the caliber that I've explained. Here's what I've tried to resolve this issue on my own. Factory reset: twice Tried different charger: I have 3. No change with any of them. Different Audio cable: Yes Throwing this thing out the window while driving: Not yet, but close! It seems that there is no resloving this issue on my own or with the help of VZW or HTC, so I've turned to the forums for help. Has anyone else experienced this audio feedback when using the headset jack and charger at the same time, or is it just me? If so, please reply back with how you were able to fix it, because it's driving me crazy. Thanks in advance.