I'm not entirely convinced it's the panel itself that's at fault here.
I've been told by my service assistant that they've repeatedly replaced the panel in certain cars. I would assume that if it indeed was the panel's poor quality at fault, BMW's QA department would pick up the slack and introduce a more durable alternative.
My wild guess is that's an assembly issue, perhaps of the fixture or something surrounding the panel that impacts, perhaps by inducing vibrations? No idea, but it seems odd to me, that you either don't get that issue at all, or struggle with it repeatedly.
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