Tape archive DV tape: the audio gets out of sync.

I have some trouble with FCPX working with my DV tapes and camera (via FW).
When importing a .dv file previously imported with iMovie FCPX crashes. When I convert the file to prores with mpegstreamclip it will import but with incorrect date info.
Now I have made a Tape Archive from within FCPX and I can import from there, but the audio gets out of sync at the end of the tape.
Any suggestions?
Peter

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Tape archive DV tape: the audio gets out of sync.

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