I’ve never heard it described as “crunching noises” before. There can be a fairly loud grinding noise when the stepper motors slip, which is scary, but harmless.
Without hearing it, I can’t say for sure.
What you want to do is:
First, don’t ever move the head by hand once the machine is turned on. It displaces where the head thinks it is, and that will cause it to bang into things and the steppers to slip when it can’t move.
Second - TURN OFF THE MACHINE. Move the head by hand back to the home position at the left rear of the machine. Then turn the power back on and let the machine finish it’s start up calibration completely before sending it any commands.
If you’re still hearing crunching or grinding noises after that, turn it off and wait to hear from support.