Over extrusion?

I try to print on my snapmaker 2.0 with the latest firmware. 1st layer is perfect. I have two issues:

  1. After a couple layers, I feel, that the hot end is dragging through the already printed part. You can see this on the edges of the printed parts
  2. I see a massive over extrusion when the direction of the nozzle changes ( see the middle )

any ideas?

Thx for the help