3GS THUMPING noise when hooking up to home stereo

New issue that hasnt happened before. Two different 3GS phones both running most recent upgrade to IOS.
When i plug the iphone via microphone jack into the computers RCA jacks a loud thumping occurs in the speakers. I've changed iphones, cables even the jacks on the computer. I've put the iphone on airplane mode, etc.. and the problem persists.
Any ideas on what this loud thumping is? Oh and the thumping persists even when the music plays through the iphone.
Tx

I'm having the same problem when I connect my 3GS to my car stereo.  There's a persistent loud thumping noise that comes through - it almost sounds electrical, like the plug on the cable is hitting some sort of contact in the jack.
It's really strange because I don't have the problem when I plug any set of headphones into the iPhone - and I don't have the problem if I connect any other device to the stereo via the same cable.
I've noticed that I can sometimes fix the problem by pushing the plug on the cable into the jack VERY hard and holding it there for a few seconds.  The problem stops and stays fixed while the cable is plugged in.  If I unplug it and plug back in, the problem starts back up.
It's really inconsistent and obviously a TERRIBLE solution - I'm sure the jack can be damaged by doing that repeatedly.
I'm really very curious if anyone else is having the problem and if there's a fix!
- Tim

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