Premiere Pro CS5 audio sync problem

i using premiere pro cs5 on osx 10.6.3.
updated cs4 , i'm not sure if it's new version or if it's problem. anyway out there can give me hand this.

have been making sort of highlight reel multiple sport videos use teaching tool. did not capture videos myself. going until updated. whenever import new video, wait conform, play audio out of sync video.

gets worse video goes on. leads me believe video playing faster audio. occurs through facet of premiere. if open video in source monitor it. or if import it same thing. happens videos i've tried. (mpg or mov). starts properly. audio starts getting out of sync within couple minutes can see difference. 2 hour clip want use audio out of sync couple of minutes toward end.

don'it think problem videos since when play them external video player (vlc) fine.

if there more information need let me know , i'll try find it. might if let me know find information might need me...

appreciate it.

 

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