My CNC router that I built following plans for Solsylva 17X20 Overhead Leadscrew CNC router has Probotix 3-Axis kit. I was creating a sign on my router when the kit blew a 3A fuse. After replacing the fuse, one of the stepper motors ran very slowly by itself without control from Mach3 program. I had to turn my computer off and on to stop the stepper motor from running very slowly by itself. Do I need 4A or 5A fuses?