Movie out of sync midway through playback

I am burning AVI files onto a DVD using DVD flick used Nero but the movie's audio totally out of sync. What I am finding is that, with DVD flick, the audio/video sync is good then part way through the show it pauses, then continue but the audio is about 1-2 sec out of sync. Any suggetsions how to fix this? The movies play all right on my computer.

 

Does this mean that the movie plays back ok from:
(a)the output folder that DVD Flick creates.
or
(b)the DVD disk on the PC

 

sorry from the DVD disk on the PC. But I was originally viewing it on my TV.

 

If the DVD plays OK on the PC - but not on the standalone player, I would suspect the disk.
When I used Ritek disks, I often found that they played OK on the burner, but skipped on the standalone.
I cured it by burning only 'Verbatim' brand disks (at 4x or half the speed shown on the package).

 

Using verbatim. I think maybe burning at 2x might do the trick as I get less sync problems.