Hey guys,
so a lil background info - i use my iphone 3gs to stream bluetooth audio as well as answer calls with HFL. so on the way home from work i answered a phone call while driving and ended it normally. When it switched back to bluetooth audio it started screeching loudly and made a buzzing noise when i lowered the volume all the way down to zero. it kept doing it even after i powered the system down and on again. Next i turned my car off at a red light and the issue went away. I work for  so i'm 100% sure its not my phone. i have a good feeling that the HFL software did not shut the microphone off after my conversation and carried the issue over when it switched to bluetooth audio. It aso looks like that since the whole entertainment system restarts when the car is shut off and on again. Anyone else ever have this happen? when i went into the dealer a month ago to have the pinging issue fixed he mentioned that another tsx was brought in for bluetooth hissing.

i was able to take a video with my phone real quick in traffic till i have to shift lol

 

I have had the same problem. It was about a month ago and it only happened once. It was certainly very annoying at the time!

 

I had same issue, happened only once. 100% not phone problem. It happened with my Blackberry 9000. Sounds like open mic channel too close to speaker.