unable to execute regression tests from command prompt

Hi,

We are running the scenarios from command prompt. If I am running for 1 hour the execution will continue for more than two hours till I close the command prompt, If I run the same scenario again it is running successfully.

why is this inconsistency of execution, we are planning a regression testing using loadui where we need to run 24 and 30 hr executions, after 24 hrs if we come to know that loadui is not stopping then our whole execution will be vain.
Is this any kind of bug with loadui. Can this condition be handled using any other options?

Please let me know if there is any solutions

Thanks,