Bose LCD Display and Back light Won't Go Out

[Jagdpanzer]

After parking the Z in the garage today I noticed the Bose radio display LCD and orange back light are now staying on after switching off and pulling the ignition key. With the key out I tried turning all of the radio, CD, and tape player functions on and off and in some cases the display went out but came on again in a few seconds and remained on.
Is this normal or is something on the fritz here? I don't recall ever seeing this display remain on before after pulling the ignition key and I'm worried about draining the battery amoung other things.