If all else fails (particularly if performance under the debugger is unacceptable), extensive logging. Start with the entry points -- is the app transactional? Log each transaction as it comes in.
Log all the constructor calls for your key objects. Since the crash is so intermittent, log calls to all the functions that might not get called every day.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.