Artifacts on top layers

Hello, I'm a bit desperate to find a solution for this: print comes out with weird "wrinkles" on top layer. Could it be related to esteps on the extruder scfg settings ? Or maybe simple lubrication on the rails ? or simply z-offset (if it's too low)? I have the impression it could be the extruder but not sure : (
Any clue or debugging steps I could apply to solve ? THANKS

material: ASA
speed: 100 mm/s
bed temp: 105 C
nozzle temp: 255 C
fan speed: 15% and 30% for bridges
IMG20241204230400.jpg
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