I may have figured it out. During many years I often encountered this problem. I work a lot with nested sequences and ProRes footage that dont have audio, but do have an audio track. Today I encountered the problem again, and decided I would render the audio. It said rendering 17 tracks, allthough I was only using one music MP3. All the empty audiotracks were still on the timeline as well. I decided to delete all empty audio tracks from my edit timeline, and voila, no more drop outs. My advice is, look in your project if there are empty audio tracks that can be deleted in your timeline. Maybe that will do the trick!
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