Auto Lip Syncing stops part way through Wav File

I am creating an animation of a mouse that will speak about a safety topic.  Have several different layers (with keyframes) for the different body parts.  Those work correctly as I scrub through the time line.

• Created a layer named mouth.  
• I have created a graphic symbol of a mouth.  Placed that in the first keyframe of the mouth layer.
• Double clicked the mouth graphic on the stage and created 12 visemes for the different poses and named them.
• Assigned the poses to the 12 sounds.
• When I clicked on the button to process and create keyframes to the recognized sounds in the wav file, it does so partially through the file but stops a few seconds into the file.  The created keyframes have the labels next to them in the timeline.   When I play, the wav file plays as the play head progresses, the frames display but the mouth stops changing after the last keyframe of that layer.  I do have blank frames for each of the layers out to the end of the wave file.  

Note;  I imported the wav file into the Library, then dragged it onto the stage, which created a layer for it.  When it appeared on the timeline, it was very compressed, only showing about a third of the actual time (in frames).   I grabbed the right side of it and stretched it to the recorded length (in frames) of the file.     The keyframe matching seems to be only working to the length of the original length (in frames) that it came in as.....

Is there a setting I have wrong, a step I have out of sequence?