Can you play the said episode directly from your HD? I have very rarely failed to burn a dvd, and in all but one cases it was a bad blank DVD. However, that one case was a corrupted Naruto episode on my HD. It wouldn't properly play directly from the HD, and when I tried to burn it, Nero terminated the burning process. I had to redownload that one episode to be able to burn that DVD.

So, make sure your source is good as well. Take good care of your HD.