I hear the sound associated with notifications and it goes off atleast 3 x an hour every several hours every day. It's making me nuts. I Pull down the notifications screen and don't find a text stating where the notication came from, i also check the phone to see if a recent call came from a blocked number and I check texts and emails to see if the recept of either came in at the same time as the sound notification but this proves fruitless too. Someone please help. I'm seriously about to blow my brains out if I can't figure out where this is coming from and how to stop it.