We hope Realtek will solve this problem in the next SDK for the next firmware.
Pending the bug fix, you can try the following tip:
- During movie playback, press MENU and switch audio track to another one.
- Then, select back the previous audio track.
The audio video will be played back with correct audio video sync.
Note: when you launch a movie with Dolby TrueHD track from the beginning, the audio is perfectly synchronized to the video part.