Problem could also be the OEM Porsche tool for loosening and fastening the headlamps. It's made of aluminum and can wear out.
Had the same problem with an OEM headlight. Changed a bulb, put the headlight in, used the OEM alumiunium tool, got a clack, thought headlight is fixed correctly, but it wasn't. Breaked hard, headlamp flew out of the mounting, bumped on the front fender (leaving lots of dents) and away. Never used this f… OEM tool again.
Regards, Markus
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