Do you see this dialog when it shuts down?

If so, the next time it happens can you put "For Orlando, from Lori Lou". With that I can cross reference the issue you are experiencing.  Unfortunately crashes are part of the desktop landscape. Reasons for that include:

• Errors in our code
• Errors in third party code we depend on
• System issues, for example a Microsoft update that breaks how things work
• Update issues, where the product was partially updated
• AntiVirus or AntiMalware type interference
• Network & caching issues

Sometimes, going into the Start Menu and choosing ProSeries -> Tools Repair Updates can fix things (by repairing any crashes caused by a partial update).