Call it whatever you like. Design flaw; low bidder manufacturing; inferior plastics used in manufacturing (wrong specs or substituted by low bidder without Porsche's knowledge), etc.
Here's a short list of the crappy parts on our cars that will go out every couple of years and won't be recalled and paid for by Porsche Cars N.A.:
Coolant Expansion Tank
Seat Belt Receptacles
Ignition Switch
Windscreen Clips
I'm sure there's more flimsy parts I am forgetting...