Hello.
I have the same problem but I don't think it has anything to do with DSub.
I have the international SGS3 that almost just got an update (well actually 2 very short after each other). Did your Note 2 also get an update?
I also experienced this problem. When I try to open the files with another player (stock og google) it just tels me that the type is not supported (MP3's) or that the file is corrupted.
So I copied a lot of the music manually and played it with the Google player and all went fine untill my trip home with the bus. I couldn't play the files any more and DSub had not touched the files. I then thought that I would watch a movie and started the player but there was no sound. So I restarted the phone and voila! Music worked again. Movies had sound and everything was good.
But I have also had the problem that my alarm clock doesn't play ant sound and just vibrates. I sleep too deep to be awakened by this so I have slept long a couple of times.
I think this is related and that we should address Samsung with the problem. I'm going to write them this weekend and call them monday. This needs to be fixed!
Please let me know if you find out something about this problem. Specially a fix!
Kind regards
Nicolai