I just bought a Chinese 3040Z-DQ 230W Four Axis Ball Screw CNC and followed the instruction from the manual to configure the machine with Mach3.
I started testing the machine with simple X Y Z commands using Mach3and my keyboard and noticed some really rough noise and experienced motor blocking/skipping at random locations on the X and Y axis. I did not experience anything wrong in the Z axis. There is definitely something wrong with the machine and/or configuration and I'm trying to get your advice on how to fix this and if any of you ever experienced similar problems.

To get a better idea on what I'm referring to, please watch my video and notice the problems encountered at 0:03, 0:11, 0:19.

Thanks for your help