odd yet consistant problem

This ole mill I upgraded with soundlogic breakout board and Rutex servo drives has an odd problem...I bet one of you sharp fellows can tell me what's wrong......Has always done this from the first moment I setup ...I am using Mach2.....
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.. When I jog an axis back and forth repeatedly , after a couple passes that axis , and only that axis stops functioning..Indeed at that moment, that motor's leadscrew can be turned by hand , there is no fighting back from the rotary encoder senseing change and compensating...
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....Then if I want to I can go to another axis and jog it back and forth a few times and it will stall the same way also....I should also mention that on the mach2 screen , the DRO will continue to change numbers as long as I hold down the jog button but motor doesnt move..
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Now here is a clue...After the stall , if I poke E-Stop which cuts power to the control cabinet- the breakout board, power supplies , servo drives et all. Then restart it and reset on the Mach2 screen, then all servo motors will again function normally..
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The only thing that I know I have not done 'correctly' is I am using a 12 foot long printer cable when 6 foot or less is advised..I just havent gone the 24 miles to town for parts in a while..
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I have changed around all the configuration variables like minimum pulse width in motor tuning , nothing I have tried inside Mach has made any difference....And incidently,,, there has never been a stall during the running of a program, only during jog , either by keyboard or mouseing on the screen ..
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Anybody?
Steven


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