Coming home last night from our 400 mile trip my wife was in the back of the Acadia watching a DVD and it just locked up. I went to eject the DVD and nothting happend other than it said "Ejecting DVD" on the screen. It wouldn't come out so we just turned the radio on. This morning I tried ejecting it again and what do you know, it came out like normal. What do you think could've happened? Should I take it in and have the dealership take a look at it? I'm sure if I bring it in it won't do it again, but I don't have the extended warranty and I'm sure it would cost like hell if the DVD stopped working later on when it was out of warranty. Do these systems have many problems? I was hesitant to get it because of stuff like this, but it sure is nice to have too.