This might have occurred to you while working with outlook. It might seem frustrating when you see it crashing and then restarting in an endless cycle.
The possible reasons would be the Add in’s which you have in Outlook. One possible solution would to be to do a repair of Microsoft Office. This can be done by going to the Control Panel, click on Microsoft Office and then click Change. Then you would be given an option of doing either an online or offline repair. This should probably solve the problem.