I've been enjoying this Knight Rider set quite a bit, but as I just watched an episode with some random crackling sound in the audio, I wonder if my set may be defective. The episode is called, 'Just My Bill' on disk 1, side b. The audio starts to have this crackle sound over it at approximately the 10 min mark, when Michael is just about to enter the senator's office, and continues for a little while as he is chatting with the young lady inside the office. After this point it comes and goes with most of the audio sounding great, except for a few occasions. It's not overly loud and you can hear all dialogue/sound effects over it, but it'd still be nice if it wasn't there at all. This is the only time I have noticed any problems and all the episodes I watched prior to this have been fine. Has anyone else noticed this, or is my set defective?