When I play DVD with Power DVD 9 on my LG blueray drive, sound and picture does not play together, sound play before the picture does, and sometimes the sound would hesitated, wonder if it;s hardware or software issue, updated all the drivers for the motherboard, which is Asus AT3N7A-I and blue ray drive is LG CH08LS10, Please help, been trying to resolve this for 2 weeks