When exporting swf long sound files won't play

I want to export my movie as a swf to watch online but when I export it 2 of the longer sound files just don’t play, while all the shorter sound effects play fine. The files are 15 and 25 seconds long.

I’ve searched for hours but can’t find any solutions, are there any settings I could use to make them play? The only solution I can come up with is importing the movie into flash and re-adding all the sound from scratch, which I’d rather not do! Please help me! ???