I had the same thing when I fitted an mp3 changer beside my original CD changer in the glovebox. The trick was to tell the second CD changer that it should assume a different network address (I think CANbus not MOSTbus address).
It was to jump two pins on it's connector - one spare pin was shorted to ground. I will try and find it. I am not saying this will fix your issue but is a good place to focus.
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