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I'd listen to the reference audio along with the OMF, and see if the drift is linear. That is, is it .5 frame off at 5 minutes, 1 frame off at 10 minutes etc.
One sure way to check sync against reference is to pan the reference left, and OMF dialogue right. Any sync discrepancy will be obvious right away.
That would be a clue…as to what I'm not sure since as mentioned above, 2 frames after 20 minutes doesn't fit any sync problem profile that I know of.
Andrew's hypothesis is the most likely, IMO.
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