I believe that means the player has experienced a read error & can't process the video correctly.
It probably means your disc is bad.
I think you are right. I just popped in a different movie and it started with no problems.I have not used my XA-2 to watch dvds since I got my Oppo 93. So I only keep the XA-2 in the rack for the dozen or so HD DVDS that are have not been replaced by Blu-Rays.