You are missing steps by the sounds of it. This could be Noise, not actual noise in workshop but electrical noise from Spindle or some other device.
But it's more likely a mechanical issue. Lose wires, lose motor connections, worn bearings, sticking or binding axis.

Could be over tuned motors.?

Personaly I would start with checking all wiring connections, separate any signal wires away from power wires.
Next would be mechanical checks, Motor Couplers for slipping, bearings etc for binding.

Next would be making sure it's not your code.!

Then start looking for Noise sources and taking measure to prevent.