The CNC was executing a project and noticed it drilled deeper than I expected, and it moved as it should be given by the commands. Then the spindle and the stepper motors stopped just before I clicked on Abort on the GrblController application.

I closed the GrblController and reopened it, then the whole CNC does not execute any commands (moving X, Y, and Z, and turning the spindle on and off.

Any idea why this happened? I tried googling around for the same issues as mine, I haven't had any luck yet. I have also tried to pull the plug on the CNC and restarted my PC, but it doesn't help.