Problems with audio in quicktime file for dvd authoring

i have converted sequence into quicktime file for burning into dvd. i have am experiencing some problems with voice over which disappers and comes back later in the quicktime file when i play it. this quicktime file is made as self contained movie. I have traced this back to the original sequence in the timeline to a white line or series of line in at the top of the time line. one is for video and the other is for audio. when the first line appears the voice over gets interrupted and audio stops in the quicktime file but its ok in the timeline. when the white line shows again the voice over can be heard again in the quicktime file and audio stops again at the start of another white line. there is no loss of audio in the sequence in the timeline. so please can someone help me understand what the problem is.

thanks tom. i am refering to render bar in the timeline, upper for video and lower for audio. May be i shoud describe them as white line gaps between dark grey or steel grey bar color.
what do you mean by down mixing? please advise

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