Missing sound on part of tape

Bought a used DVX100B a few months back and am still learning how to use it and have a strange problem I cannot figure out. I shot a high school play for which I took a feed off a sound board via the XLR input. All recorded fine and play back fine. I used 2 tapes and the first tape imported to my computer without any problem. When I imported the 2nd tape onto my computer, the sound from the first 2 scenes of the play is completely missing even though I can hear it playing through the computer speakers just fine. At the beginning of the 3rd scene, the sound starts recording again. Adding to the mystery, this is a used tape and the first half second of the previously taped program imports as expected and can be heard in the imported file. I have tried importing into both iMovie and Final Cut. I also have tried using a different camera to import from. Same results. Could this be some flaw in the tape or did I inadvertently change some setting between the 2nd and 3rd scenes? (When I shot the play, I hit the pause button between scenes. Could I have changed something else on the camera that would do this?)
 
Figure out a workaround. Exported the sound via the headphone jack into my computer with Amadeus and then sync'ed with the movie in Final Cut. Worked great but still would love to know what caused this!
 
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