Roughing tool path won't finish

Hello, I am using vcarve desktop I create a roughing tool path and do preview then create finish tool path an do preview, I save both tool paths separately, I then import the roughing tool path into easle and start carve. After a minute to an 1/2 hour the xcarve just stops and goes no further.This has happened to me on every attempt I have made with any model. I can not figure out why I can not complete a roughing pass.

I had the same problem and what was happening is my computer was set to fall asleep after an hour so I went into the settings of the laptop and changed it to never fall asleep.