What operating system do you have?  I am using Vista Home Premium and had a serious problem with crashes.  I was told to switch the options to run it in XP compatability mode.  Just doing this one thing has helped quite a bit.  It still occasionally crashes but not nearly as much.  I have exported from Daz Studio and imported and not had much of a problem.  Certainly NOT crashing every render attempt.  That's my 2 cents.  To get more help, I suspect you'll have to be more specific about your specs.