R6Girl - what's the TCU stand for? I'm having the same symptoms except its hard to diagnose. I seem to have an additional one where on my non-DSP system, the Audio button doesn't bring up the audio controls most of the time. If I use 'Tone' it comes up every time.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean