Stop of Program

Hi,I use a board with a NET+50 processor, this board is a specific board based on the evalution board netsilicon. My problem is my application run during 1 or 2 weeks without problem, and like that the programm stop and nothing is acessible no ethernet not serial port … For the moment the wtachdog isn’t enabled and the soft run into the flash. How known where the programm crash ??? If a person have a good idea ??? Thanks. Joey