Hi ,
Would be interested if you came up with a cause /solution for your problems as we are experiencing the same problem.
for example: Building 10 Machines and 6 or 7 randomly fail in different places .. and 3 or 4 will build successfully.
Build the same 10 machines again and have the same ratio of failure but not on the same machines.
Using Dell , different makes and models. (780's 790's E6320's E6400's E4310's)