I have had this issue in the past with layers which do not adhere properly (layers separating).
The print starts of with the raft printing correctly until the last 2-3 layers, the layers seem to be extruded with a larger than necessary gap on the Z axis resulting in failed prints
I have 5 Zortax M300 printers and 7 zortax M200 printers which all work perfectly and have been for the past 2 years
I have also had this issue in the past with the M200 (photos bellow)
Please if you could give me any tips on why this would be happening and how to resolve it.