Now I have melodyne I'm happy to wave goodbye to v-vocal. I won't be crying...

Go to Preferences and open the aud edit file increase your bounce buffers and extra plugin buffers as high as it will let you. That fixes it for me

+1
 
V-Vocal works similar to Melodyne in that it looks at more data than simply "time now."
 
Try adjusting your ASIO latency up (Edit->Preferences-Audio->Driver Settings) a step or two at a time until your buffer samples get closer to the "1024 samples" that Melodyne recommends and see if the issue gets better. The I/O buffers will probably be best at ~512 (Edit->Preferences-Audio->Sync and Caching (Advanced Mode)).

Thanks so much for the suggestions everyone!  I'll try some of these.  I'm thinking that it may have something to do with the audio buffer adjustments, that would make sense.
 
--Jim 

Another great tip for any file or project that is having issues with crashing is to "save as" the whole project under a different name. This rewrites every file to another section on your hard drive. Sometimes, if you have come back to work on a project after you've been using your computer for another task, your project files can become defragmented, and re-writing them to another portion of your HDD will keep them contiguous. Have used this fix many times on crashing projects and it seems to work most times. Not just in Sonar either.

And check your event viewer.