Random audio dropouts from FCP 4 to Quicktime Movie

Never experienced this headache before, until today...
I've built my project as per usual in FCP4 - no problem. Then I exported project as Quicktime Movie for iDVD4 but I noticed that audio disappeared in two different sections - each portion of silence lasting a minute or so.
I went back to FCP and exported a new Quicktime Movie - almost the same result only audio disappeared in a different section for three minutes or so. Back to FCP and I built my project on a new timeline (Sequence) - same result when I exported to Quicktime but again, dropouts occur in different sections.
At present, I'm exporting each of the 10 Sequences that make up my project as separate Quicktime Movies and so far, I've completed 2 with no audio dropouts.
Does anyone have any idea what could be causing this problem?

Never experienced this headache before, until today...
I've built my project as per usual in FCP4 - no problem. Then I exported project as Quicktime Movie for iDVD4 but I noticed that audio disappeared in two different sections - each portion of silence lasting a minute or so.
I went back to FCP and exported a new Quicktime Movie - almost the same result only audio disappeared in a different section for three minutes or so. Back to FCP and I built my project on a new timeline (Sequence) - same result when I exported to Quicktime but again, dropouts occur in different sections.
At present, I'm exporting each of the 10 Sequences that make up my project as separate Quicktime Movies and so far, I've completed 2 with no audio dropouts.
Does anyone have any idea what could be causing this problem?

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