Questions about layer inconsistency

Hi everyone, I had recently gotten myself a Neptune 4 Pro, and after some TLC it was working really well. However, after a week or so of printing I started getting some weird lines on my prints, as shown in the photos.

What can be a possible cause? I would appreciate any tips on what I might have missed.

I purple part was printed with 0.16mm layers with the stock nozzle, the pink one with 0.2mm layers. I have updated to the most recent firmware, made sure the gantry is nice and parallel to the bed, did all the calibrations for the filament profile, leveled the bed, got the z-offset dialed in, eccentric wheels for the z-axis just perfect, and I am printed these at speeds not exceeding 180mm/s and acceleration not more than 3k. I am using Orca for slicing.