Nero 6

I go to burn home videos with nero vision express 2 from mpeg to dvd. For some reason it closes in the trancoding session? So I tried another home video and it worked so I went back to the one I was having the problems with and it didn’t work, so you think there would be a problem with one of the videos but then I did them all one by one. One wouldn’t go then I would try again then it would go. So it can’t be the videos if one time it won’t go then the next time it will go??? I have been working on what should be a simple project for a few days now. Why would the program just close? What can I do to make my project much easier then doing the videos one by one and keep trying the ones that won’t go until they do convert to dvd?

Thanks for your help in advance