Running the file and I got this…
What the heck…
Loss of connection, probably due to EMI.
Are you cutting slots which are just as narrow as the endmill? That makes cutting more difficult.
Add geometry and cut as a pocket down to tab depth or the penultimate pass — you should be able to just restart the cut w/ new toolpaths made from the same file.
I was finally able to restart from the beginning is there no way to start at the failure point?
There is no good way to start at the failure point. Some people have been able to hand edit the GCode file to remove the parts that have been done, but that requires a level of knowledge about GCode that most people do not have.
If you have multiple toolpaths in your GCode, and are confident that some of them have successfully completed, then you can resave the GCode with those paths disabled.
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That’s what I was afraid of.
You continue to advance my knowledge level
Did it happen to stop while you where operating other equipment in you shop ?
I noticed mine failing occasionally when I turn the Router and Vacuum off while switching bits, it seemed quite random at the time, However while doing test air cuts, I could make the controller randomly disconnect while turning equipment on and off which defiantly points to EMI issues, I am still working on the right solution 
I assume I need to find the right filter
Maybe that might help you narrow it down as to where to look.
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