What format is the video file you are burning, and what sort of disc format are you burning?
The only time I have really had burn problems with any software is when I left my computer on for a few days, and had burned several projects, once I rebooted, that solved my problem.
What do you do when you burn, do you do other things on the computer? If so, maybe what you did took too much of your computers resources and cause this... it is hard to say.