Why is audio out of synch when I share (export) to mp4, BluRay (FCPX 10.0.9)?

Audio that is carefully synched to the video in the timeline appears off by several frames once I share the files to Bluray or mp4. I believe, but will double check that I exported to DVD without this issue. Any suggestions for fixes would be greatly appreciated.  Paul

Sorry it took a few days to reply Russ.  I wanted a chance to go over the videos carefully.
It does not drift further out of synch, and the synch issue only affects a few short segments of a 42 minute video, one near the beginning, another near the middle and another nearer the end. The segments that have the issue ones were ones I overdubbed audio from an external recorder (Zoom H6) that I used when the video was shot.  However, there are many more segments in the video that were similarly overdubbed using the Zoom recordings where synch is not a problem.
On the weekend I tried making compound clips of the problematic segments in the hope that it might accomplish something but it didn't make a difference at all in the Blueray disk I burned-which I played on my aging Samsung Bluray player.
Here's another interesting fact about this problem:  all of the mp4 files, I discovered, play perfectly in synch on my Mac.  It is only on a PC that some parts are out of synch.  Should I be using Quicktime files for PC instead of MP4?
Thanks for your interest in my little problem Russ.

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