Leaving the USB cable accessible is definitely the right thing to do. However, you can disable the module for routine trips to the service center via the turn signal stalk.
Though it's dire straits, there is an emergency method in the z4 owners manual to manually raise the roof. Not a fun procedure but at least you should be able to remove the module in the midst of (most) failures to close. before taking it in. The plug & play harness makes it that much less detectable.
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