Program randomly stops running

I really am at my wits end on this one.
I am running a very simply surface planing pass and the machine keeps just randomly stopping.
When it stops it always resets the x and y zero and sometimes resets the z zero.
I started with a program that was starting at X0Y0.
I was using a back and forth along the x axis with a G1X625 going one way and an G1X0 going the other way.
Inbetween I was using a G1Y10 for the stepover between passes.
The depth of cut was 2mm
The feed was 254mm
The 1st time it stopped I was half way through the 1st move back to X0.
I thought that maybe I had too high a feed rate so I tried again by slowing down the feedrate on my hand controller to 70%.
This time it stopped halfway on the 1st pass.
I then removed the Vaccum hose from the dust boot and slowed down to 30%.
This seemed to be working fine until I was on the 4th time to the X625 and it stopped at about 610 on the x move.

Any help on how to trouble shoot this would be greatly appreciated.

 

I went through all the wiring, double checking the connections.
I forgot to mention that I am running the program from a USB stick that is plugged into the touch interface.
Here are the lines of code and the program is consistantly stopping at the same place.

G90 G94 G17
G21
G54
S10000 M3
G0 X0 Y0
G1 Z0 F254
G1 X625
G1 Y10
G1 X0
The next few lines after this are (not sure how many lines it looks ahead from the touch controller using USB)
G1 Y20
G1 X625
G1 Y30
G1 X0
G1 Y40
G1 X625
G1 Y50
G1 X0
G1 Y60
G1 X625
G1 Y70
G1 X0
G1 Y80
G1 X625
G1 Y90
G1 X0
G1 Y100
G1 X625
G1 Y110
G1 X0
G1 Y120
G1 X625
G1 Y130

Any additional suggestions are appreciated.