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Sync issues with merged clips in FCP 6
Greetings,
I’m editing a long form project in Final Cut Pro 6 on an OS X 10.11.3 Macbook Pro. Editing has been relatively smooth however lately I’ve come accross a frustrating issue with merged clips audio going out of sync for no apparent reason. Footage is prores 422 at 24fps (from a black magic cinema camera). We shot sound separately and I synced the picture with sound via merging the clips that were organized in folders in the browser window.
The process has worked up until recently when for some reason some of the clips appear to randomly go out of sync. It’s not a sync drift issue. It looks like there’s some issue causing the sync in points to move drasticly out of sync. It’s not all of the clips, just about 5-10% of the timeline. I have a version of the project from about a month ago and everything is perfectly in sync. The only thing I’ve done since then is continue to edit as well as sync via merging some additional footage and add them to the timeline.
Here’s a screenshot of what the clips look like in the previously saved version of the project with no sync issues:

And here’s a screenshot in the recent version of the project where the merged clips are going out of sync:

Does anyone have any feedback as to why this is happening and what I can do to avoid it in the future?
Thanks in advance for any help.
Immanuel