Apple iPhone Smartphone "youtube stops playing goes back" Questions

...stops and goes back to the home screen any ideas on this one? hi i also have a similar poblem i bought an unlocked 1.0.2. i live in the UAE everything was working great untill one day when i was ...

...youtube, there is no sound whatsoever. Anyone know what is wrong? mybe she turnd off the sound try to turn it back up, on the side there are these buttons that go up and down, click on the one that ...