If I were a gambler, my money would be on an infrastructure/man-in-the-middle or social-engineering attack vector. The people are likely stressed and the code is admittedly troublesome.
Godspeed.
Even if your code has full path coverage, you're almost certainly going to interact with an unpredictable outside world that can cause code to fail in novel and interesting ways.
Yes.
(http://www.f-22raptor.com/news_view.php?nid=267)
> Don Shepperd told CNN Television that the onboard navigation, communications and fuel systems crashed as the planes crossed the International Date Line.
> The problem seems to have arisen not from the time change, but from the change in longitude from W179.99 degrees to E180 which occurs on the International Date Line.
> The USAF refused to specify the cause of the issue saying only that the aircraft "experienced a software problem involving the navigation system en route from Hickam to Kadena".
The Wikipedia article List of Software Bugs has some other scary examples of billion dollar systems destroyed, or people killed, by bugs.