Problems with Mach3 Jogging.

im having a problem with jogging using mach 3. i would use the arrow keys to jog the x and y axis. right and left key to jog the x axis and up and down key to jog the y. When i first boot my comp and launch the program, everything will jog fine, but later on, i would press just 1 key and it will jog both axis's. Anyone have any clue whats wrong here?

I had a problem like this where sometimes I'd press an arrow key to jog in the X- or X+ direction and the machine would continue in a different direction when repressing the same arrow key.

Shielded cabling solved the problem.

HTH