Why is my print going so horribly wrong after the 5th layer?

[webm305]

Hi all, can somebody maybe try to give me an idea of why this is happening to my prints after they start off so well?

I?m printing a box on my CR-10 using Cura with Amazon PETG at 0.4mm layer height and 220c/80c temps. The layers stick great to the bed and look perfect until after the triangles finish on the 5th layer. After this the layers curl up really bad as you can see in this pic.

Is there a setting on Cura which I should be changing or modifying? Any suggestions on what i can do here will be greatly appreciated?
Thank u!