I have struggled with getting a good wireless connection to CarPlay on my 2025 Taycan 4S as well. It seems to break after some iOS updates or any service updates on the car. The method I found that works best is to go CarPlay settings on the phone and delete the car. Turn off the car, wait 5...
I have the same issue with my 25 4S. Tried a PCM reset to no avail. Finally took it to the dealer and after a week they were still not able to fix it. All they did was another reset which did not work. Seems to be a bug deeper in the system.