I saw your post about your Cayenne rough downshifting / lurging issue. I’m having the same issue, and same non-response from Porsche. If you’re in the USA, please spend 5 minutes flagging this safety issue through a complaint form with the NHTSA. Its super easy, and will force Porsche to respond to this safety issue publicly. No company likes dealing with regulators.

To file a complaint, simply:
1. Go to https://www-odi.nhtsa.dot.gov/VehicleComplaint/
2. After you enter you VIN, select “Brakes” and “Power Control” options
3. Enter a description of the breaking / safety issue, your contact info, and you’re done!

Hopefully they’ll fix this issue after 2+ years of complaints!