That may be it. I cancelled all three movies that had stalled and tried downloading only one from the start(but a different version/size/name, etc.) It finished successfully in one sitting. i haven't tried any more since then, but I will this weekend.
I just remembered that i changed one or two settings in the middle of the downloads that stalled, including the folder that files would download into. It said the changes wouldn't take place until I restarted limewire. I don't know if that was a factor. Either way, I hope it was just a one-time thing. All three are cancelled now and I'll put it behind me until it happens again.