X1C Top layer finish inconsistent

Hi All,

I read more topic's with a bad top layer finish, but my issue is somewhat different. Overall the top layer finish is OK, but sometimes the X1C screws it up.

This is a normal top layer finish with which I am satisfied

https://preview.redd.it/3f11779hcoka1.png?width=652&format=png&auto=webp&s=760e2c91954ae6eeee2437c07cd70eab9ea2724f

And sometimes it comes out like this. You can see underextrusion and there are many tiny squares visible.

https://preview.redd.it/ck1nx5imcoka1.png?width=658&format=png&auto=webp&s=b283d29d5b8fb16d05aa41958d7bacabc2f6ca36

I continuously print the same file, so the settings remain the same, but sometimes it comes out as the 2nd print in the photo. Filament also remains the same. I'm not using flow calibration, flow is manually calibrated and stays the same.

I'm printing with eSUN at 210 degrees with gyroid infill and 4 top layers. Top surface is Monotonic line.I also see this problems with some other models I print using Fiberlogy filament at 230 degrees.

I'm really unsure what could be the cause of this, hope someone can clarify.

Edit:

Another example of the same problem. these prints where directly printed after each other. The bad one first and the good with directly after. Same print, same settings, same filament and same printer.

https://preview.redd.it/zrj933i32pka1.png?width=993&format=png&auto=webp&s=9db7c69c633359040deeec8c3a4324165354a9d1