Video - Audio out of sync on long clips - CC 7.2.2

When I import long DivX-encoded videos (90+ minutes), video-audio is synced perfectly near the start of the clip.
But 60 minutes in, the audio is about 1-second ahead of the video - like a badly-produced Kung Fu movie from the 1970s.
Near the end of the clip it is even worse.
I have been Unlinking clips so I can move audio and video independently, but it has tripled the time required to complete a job.
Any idea how to resolve this?

Thanks for the speedy reply and the link.
I would like to try converting to a different format  -  I expect to lose some quality but that's ok.
Can you recommend a couple formats to convert to?  And, even better, the names of some apps that are up to the task?  :-)  I can google around looking for them but it costs nothing to ask.
Thanks again John!

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