Creative ZEN 4gb video gets out of sync, please h

When i play back relati'vely long videos (around 30 minutes or more) on my new Creative ZEN 4gb? the audio part of the video i'm watching becomes out of sync with the video after 5 minutes or so, hence the words that characters say don't match up w/ their li
ps.
get the picture? it is REALLY annoying and i've tried firmware .20 and it didn't help, i've also reverted to .0, same problem. is it just my player or is this a common occurance and what can i do to fix it's thanks a bunch. and don't get me wrong, i think that despite the bugs the new ZEN is a good player.

hmm... come to think of it, that makes total sense. that could also be why the screens lag a bit when i'm listening to music and browsing my system settings as fast as i can. i'll try encoding my videos at a lower bitrate tomorrow, have any good setup in mind? (i.e. xxxKbps format-.xxx audio xxxKbps format-.xxx) also, i would think that a high bitrate (high enough to slow the player down) would produce visual slowness in the videos, and thus i could tell if that was the problem or not. but i haven't noticed visual slowness so does it work some other way or is it just so subtle that it takes a while to notice the video losing sync with the audio?

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