DVD Audio sync

[Bluethunder]

I haven't had much luck with this..

When I start the dvd, its fine. As time progresses, the sound lags the video. By about 30 minutes, its about 1/4 second behind. I'm using SPDIF out.

I was using PDVD 6, & AC3 decoder.
I have an upgrade to Pdvd 7, so I changed it to PDVD 7, PDVD audio decoder, and PDVD audio renderer. After 30 minutes or so, the audio stops, and syncs up again. But its really bad before the "sync"

Has any one else encountered this, or have any ideas on a fix?

Thanks

[sub]

The usual fixes for this type of problem are either setting the audio renderer back to 'system default' and/or change the audio decoder to something other than what you're using.