LG Voyager VX-10000

I had posted a couple threads earlier about video playback problems on the voyager. I dont think it is the phone - i could be wrong...If i were to watch a movie/tv show -- it'd play fine watching it from start to finish.....but if i wanted to skip, even a lil bit forward, or jump back ....the sound would lag behind the video. There would be a sync issue. If anyone has any advice as to what may be going on..it would be most appreciated.