Mysterious blue zipper line on video tape

100b

New member
I was shooting some bands the other night. The first tape turned out OK, but on the second tape there is a strange (and obvious) blue zipper line where no video was recorded. I have a DVX100B and the tape is Sony.
Also, on the same tape a shoot I did later that night came out OK.

I'm wondering if audio levels were to high or ???????

sample is at :http://www.youtube.com/watch?v=m4nI2sjQ-EU

Any ideas, knowledge or past experience is appreciated in advance.
 
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