Audio sputters and then completely cuts out during playback

Hello, everyone.  I've been editing in iMovie for years, and have never come across this problem until today.
When playing back a clip that I've inserted into my project, the audio sputters on and off for about 10 seconds, and then cuts out completely.  If I stop playing, and then start again, the audio comes back, but in about 10 seconds, sputters and cuts out once again.  When I play back the original clip that I imported, this does not happen.  It is only when it is actually in my project.  The audio waves shown below the video are all intact as well. 
I've already tried restarting the computer and deleting the iMovie preference file to see if that would make a difference, but it has not.  Any ideas as to what this could be, or even better yet, how to fix it?
Thanks for your time.

Update: When detaching the audio, this problem goes away.  However, the audio fade-ins from transitions, etc. go away.  Is there any way to solve this problem without detaching?

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