I have some problems with my CNC Machine.

I got this CNC, that had this all in one controler (not using mach3), and had a problem on one axis.
I bypassed its original controler and used a usb BOB, along with a pc (win10), and mach3.
Once I got everything setup it has been working flawlessly for one year! Really erfect!!!
Recently I made a shelf for the huge controler box so I could gain bench space in my garage.
I place the new BOB next to the old one, got a longer usb cable and everything is the same.
The old controler is still connected to turn on/off the spindle.
Now its loosing steps.
Actually, it looks like Mach3 is freezing and it stops on some lines of gcode....
The machine looses position and goes all over the place.
All the software is the same.
Seams to be affected by the spindle running.
I tried removing the BOB from the mounting position because it could be the spindle vfd affecting it but its the same.
Any idea?

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