Was könnte hier passiert sein?

Because there is nothing about the print speed: Set the speed to 80mm/s for all walls and surfaces. If it then the errors disappears, it is likely that it has something to do with temperature and speed. Or simply print on “Quiet”.

We also don’t know where exactly the problem arises.
It could also come from the first layer, where the filament had no adhesion at certain points and this problem simply continues upwards. You would then have to ensure proper adhesion across the entire panel.