One of my engines stopped working

Yes. A bad motor driver.
I was the one that had you switch the motors and check wiring.

Those support doesn’t care.
They preferred to return the milling machine instead of fixing the problem. We are now discussing this - return.

@AlexanderArapov Our Customer Success team has been working with you via email and phone throughout the day. Please allow us 24 hours to respond - they respond as quickly as they possibly can.

I received only 2 responses, for a lot of my letters.
And only when I began to demand a refund, then only then did you start doing something.
And I identified the cause of the breakdown without the help of your technical support.

try the grub screw on the gear or pully coming from the stepper.
could be as simpl as that

My laser cut machine motor head doesn’t not return to zero it stops halfway on the work bench.
What do I do.