Subsequent sound loops sound quieter

Anyone else noticed this in Flash MX?

I have a sound loop which is fine when initially played, but then its subsequent loops play at a quieter volume.

Extra info:

I have a movieclip which has the sound placed in its first frame.

The sound is set to “start” as opposed to “event” or “stream”

The sound in the library has a linkage that only exports for Actionscript.

The wav sound has an export setting (via the library) for Mp3, and is not overridden by the publish settings.

Anyone know the reason for the reduction in volume for subsequent loops?