Without showing the code in question people can only suggest that you debug the program, logging events in an attempt to diagnose what's going on. What error checking does your code have? Are you running out of memory? Is file locking a problem? Are you hitting an OS defined limit? Debugging and Optimization, Basic debugging checklist and so on. Don't wait to ask a quesiton in the chatterbox, just ask. People did reply to your "Hello?" question.