Xbox 360 not reading dual layer dvd

Hi all, just got a problem that im hoping someone will be able to help with. My Xbox 360 has stopped reading dual layer dvd’s, it has previously been reading them and I have made at least 10 different dvd’s and now all of a sudden it has stopped reading them, im hoping someone will have an idea of what has happened and how it can start playing the discs again.

kind regards