IPhone 5 message notifications?

I recently got an iphone 5 and sometimes i get no notification about getting a text message, no vibration, banner or tone but when i unlock my phone i have a message or two waiting, and sometimes it unlocks right to the message. I have checked in the notification settings and everything is turned on the way it should be. Any advice?

Mine does the same thing! I have no idea why. And sometimes it'll do the complete opposite and say I've got a notification then when I go to my messages it doesn't show up. But next time I go to my messages it's there. I hate it and I'm so sick of it honestly

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