Over the years there have many comments about the poor fit and performance of cigarette lighter USB chargers for G-body cars. The German lighter apertures are larger than U.S. counterparts so the adapters do not fit snugly enough. Stuttgart-Classica now sells a charger specially made for G-Body Porsches that fits perfectly and has both a USB-A and USB-C port Pricey, but it works.
https://www.stuttgart-classica.com/dashboard/cigarette-lighter-usb