My audio goes out of sync after import

I have a bunch of masters of 1h documentaries that I've done using Adobe Premiere CS6. I've exported the masters using exactly the same specs:
Apple Pro Res 422 (HQ), 23.98fps, 1920x1080p, 48kHz, 16b, PCM audio.
I have to do some changes on the masters of these shows. They all play fine on several players like VLC, Quicktime, Mpeg Streamclip, etc. However after I import the masters into Premiere Pro CC, 3 out of 10 shows get the audio gradually out of sync, even on the source monitor before I put them on a timeline. The behaviour continues even after I place them on a timeline.
The project settings are the same as the masters and so are the sequence settings. I've tried to recreate the project, delete and re-import, duplicate the file and import that, and no matter what I do the same 3 masters go out of sync after the import.
I've tried to find a solution in many forums and despite noticing that several people have the same issue, no one has a valid solution for my problem.
I cannot go back to CS6 since my company updated their systems to CS7 so I can't even cross check.
Any suggestion will be most welcome.
Thanks in advance peeps.
NJ

Couple of suggestions.
First, rather than opening the Master export, go back to the original project. That should open fine in CC.
Second, with a CC subscription, you do have access to the full CS6 suite.

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Ruta del archivo: [...].m4v
Tipo: Película MPEG
Tamaño de archivo: 667,7 MB
Tamaño de la imagen: 720 x 480
Profundidad en píxeles: 32
Velocidad de fotograma: 29,97
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Formato de audio del proyecto: 48000 Hz - Punto flotante de 32 bits - Estéreo
Duración total: 00:30:35:15
Velocidad media de datos: 372 KB / segundos
Proporción de píxeles: 0,8889

"HandBrake, these days, is almost entirely about H.264 video, aka MPEG-4 Part 10. HandBrake is migrating to quality-based encoding."
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OK, I figured out how to fix it:
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Hello there,
I'm relatively new to this, so please when you're helping me, dummy it down as much as you possibly can.
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Go to http://forums.adobe.com/community/premiere and, in the area just under Ask a Question, type in
variable frame rate
or
VFR
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My audio goes out of sync after export

Please help.

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My audio goes out of sync after import

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