I know it is going to be a pain, but this machine is built and used differently by everyone so we need more details than most.
A video is going to be key, nothing fancy at least 30 seconds of cutting preferably with a close up of the cut and then a bigger shot of the machine.
Machine size is important, especially the z height and length.
Spindle type.
Bit type (pics help)
Feedrate
Depth of cut
Material being cut