I am going mad! I have a high pitched 'dee-dah, dee-dah...' alarm which sounds every day at 11.00 precisely for about 15 seconds, yet- The alarm is not set, there is nothing in my Google Calendar, 'Notifications' is turned off, I have re-booted the phone, checked 'sounds' in 'Settings', which does not have this sound set against anything, nothing is displayed on the phone when the alarm sounds, and it does not 'light up'. Can someone please help? Thanks.