ok the chances are the install of the new radio did not cause the problem/s you are experiencing, but in saying that, if the K-line has been connected to your new aftermarket radio then it will start throwing error codes inthe ECU, which in turn could potentially cause it hence i'm mentioning this to you.
out of 7 golf/bora/Jetta Mk4 radio's i have installed only one of them have i actually used the factory radio harness.
Hopefully this sheds some light that you can try and pin point on.
Also do you know anyone that has vag-com that can scan your car for you?
Maybe then you can find out what the problem is.
Audi S4 (2001) - Imola Yellow
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