I've seen today an wierd situation. I have a theory, but it would help to know more about the windows shutdown process. If you have some knowlaged about it please share.

A machine was shutdown (at this moment I suspect an unexpected mantainace), on that machine there was a long running process that was interrupted. Monitorization confirms that the process did not terminated normally.

Loking at the logs for the long running process it seem that was just finishing. That seems higly unprobable since it was running for more than 6 hours (witch is a bit more than the usual 5 hours).

The process lanches child processes and waits for results from them, I suspect pour error control on the parent process and that the shutdown as terminated child processes before.