A1 mini. Need Help. Problems with the engine?

Bambu Lab A1 Series Bambu Lab A1 mini
1

Hello everyone. I have 2 A1 mini without AMS. and 4 A1 with AMS.
A1 is no more than 2 weeks and 200 hours of work. They have the same problem as in the video.
I don’t know if I can run the video.
In words: During printing, bearings jam or abnormal motor operation occurs. loud sound and grinding. The print head comes back with a heavy effort and the printer calibration is lost. I really need help!

I’m sorry, my English is very bad.

video of the problem

2

Do all your printers make the same noise, or is it just the mini’s? The screen says cutter is stuck, is that so?
It sounds like the steppers are cogging - not enough current to overcome the resistance. Are they like it from new, or has it recently started?