thanks all who help.
I set the SACD priority to "Multi-channel", and had tried to set it as "Strereo", but it doesn't help. My 103D is almost 3 years old, and maybe anfield is right that the laser head aged. Will try it with my friend's newer 103D and see.
Besides, for those SACDs that I could backup, Tag info doesn't often export out successfully. Anyone can suggest easy way to get the song list from the web and map to the files?