It's faulty injection mouldings, cheap plastic plus the buttons are too stiff to push which causes stress and strain.
I'll see how mine hold out once I've loaded them. In the meantime, cut your nails, wash your hands after your toilet festivities, wear cotton gloves like Japenese taxi drivers, only use the iDrive if concerned, be a bit more delicate but push gently but firmly and hope for the best or worst!
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