* do you have space in the spool directory?Yes, a lot
* is the job consuming all available memory and swap?No and yes : if the problem was with the job, there would be something in the stdout file..There is nothing.
* will you program run to completion outside of Condor?
* has your execute machine logged any errors?Yes, in the StartLog : it received a "RELEASE_CLAIM" command from the central-manager (what is it ?), and after lost connection with it. And that for both virtual machines.