Page 1 of Why wont my machine play the damn disc ?????

I just bought a R1 copy of Dog Soldiers, I loaded it into my dvd player but it informed me there was no disc inserted ? I opened the tray, then closed it and it started to play, “just a glitch” I thought to myself, I then noticed the quality of the sound was lame, I tinkered with the settings and adjusted the volume, and continued watching the film, then about 20 minutes into the film, it stopped, and returned to the opening screen you get when you first turn on the player, then a code C:0013 or something like that flashed up, none of the buttons then worked ??? I turned on & off, but the machine kept saying, no disc ?? I then tried another R1 disc, which worked fine, then tried a R2, again which worked fine. Does this mean I was sold a dud disc, or is this something to do with RCE’s which people like Play247 warn you about ?? Does anyone techincal know what that code meant ?? The machine is a multi-region Sony DAVS300.

Not a very happy man as I had been looking forward to this film for ages !!!