Corpse Bride auto-stops?

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Hello all,

I recently ran into a strange occurrence with the Blu-ray version of Corpse Bride. The movie had ended and was sitting on the Special Features screen, and I had gotten up and started doing dishes and other tasks so I wasn't there to immediately take the disc out. When I returned maybe 45 minutes later, the disc had apparently stopped as the PS3 was back at its own XMB menu screen.

I thought someone else must have stopped it, but I asked my girlfriend and she had not. So I did a little test - I got the disc back to the Special Features menu and just sat in the room and did some work on my laptop - and sure enough, the disc auto-stopped after about the same time.

Thinking this was a general PS3 feature or maybe just a Warner feature, I tried some other Warner titles - Assassination of Jesse James (recent Warner title) and Blazing Saddles (old Warner title, from maybe a week before Corpse Bride). Both sat at the Special Features menu for an hour and a half or longer, and never auto-stopped.

So is this just some weird Corpse Bride feature that Warner hasn't used en masse? Or is this a fluke with my particular disc? I'm considering getting another disc (maybe rent it from Netflix) for testing purposes, but I figured I'd ask here first. If anyone knows anything, or has the time to let Corpse Bride sit on the special features menu for 45 minutes to an hour, I'd greatly appreciate it. Thanks for any responses anyone has!