Audio Sync Issues in with Quicktime and MP4

Hey all,
Strange issue.  When I play the files via Quicktime on my computer, the audio is in perfect sync.  When I import into Premiere, the audio is about 6 frames late in the source and when dropped on the timeline.  I have the latest version...not sure why this happens.  It usually happens on clips that are more than a few minutes long, like the audio is 100.01% faster than the video and gradually gets more and more off sync later into the movie.
Any suggestions?  I haven't found any similar problems online so I'm assuming I'm doing something wrong?
Thanks!!

I am dissapointed to see that no one has addressed this issue. I have similar issues.
The MP4's play perfectly in the quicktime player but in Premiere they are off by varying degrees sometimes up to a minute even. I had similar problems in the past with files from the same producer. However last time I was able to  change the extension before importing and then sync them up manually on the timeline. It worked everytime. This time however when I change the extension Premiere brings it in as an audio only file.

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