I have had my tablet for a few days now (IT2006 loaded), and twice I've noticed hearing the Nokia startup song across the room when it wasn't in use.

In both cases, the device was in "sleep" mode with the cover on (magnet turns the screen off). It wasn't in fully "off" mode.

I've just re-loaded the IT2006 OS to start fresh to see if it happens again, without any apps/hacks/mods/etc loaded.