Ender-3 S1 Pro - bottom layers warping

[chris29]

Hi

I bought recently my first 3D printer, Ender-3 S1 Pro. I'm a newbie in the topic of 3D printing but I watched a lot of videos, read articles, etc.In general I'm really happy with the print quality out of the box. I have one issue. As you can see on the pictures the bottom layers are not bonded together really good and the corners are bit up. Looks like the bottom part is warping, shrinking too quickly. Or maybe it's different issue? Can somebody can please advice me how to solve this? I already tried to bum up temp of plate from 60 to 65 deg for the first layer. I tried to increase temp. of first layer to 220 deg. I also tried tu turn off fan cooling for the 6-8 layers. Nothing makes much a difference. I'm using standard settings for this printer in Creality Slicer and Prusa Slicer. (also tried changes mentioned abaove). I have also performed manual bed leveling.

Nozzle: 0.4 mm
Layer: 0.2 mm
Nozzle & bed temp: 215 deg
Filament: Devil Design PLA (suggested manufacturer temp 200 - 235)