Over the last several years, my computers were plagued by program stoppages. "Computer found a problem and shutdown..."
The computers use a Parallax USB to RS232 Rev B interface to BS2 micro controllers.
A NASA engineer familiar with USB interfaces analyzed this problem and determined that when the computer reads the driver code from the USB to RS232 chip and loads the driver into the operating system a condition is setup where the computer will detect an interface problem as data is sent to the computer for display using the DEBUG instruction. The computer shutdown usually takes several weeks to occur but it does occur. With the USB to RS232 interface removed the computer runs the program and never fails. Tests have run for over eight months with no computer failure.