Help! Sunplus based video player lags and freezes :(

[alex2pb]

I need some help guys, I dunno what to do. I have a player like in my avatar and no matter how i convert the videos (this one plays mp4 files), after 30-40 minutes of playing, it starts hanging, the sound goes out of sync, and the video freezes for a few secs then continues. It's really annoying, barely watchable. I tried SUPER converter, the software from the CD, media coder and lots of other tools. It simply doesn't work well. How can I solve this? I tried lowering the bitrate, the quality the frames, nothing.

Help is really appreciated. Anyone with sunplus pmp can confirm this behavior?

[Marco16]

download mp3 player utilities 3.68 no freezes the video
exept the resolution is very small

I hope will you help
Marco16