This problem has persisted thru the betas and now the final release. Notifications that are set to "banner" never disappear once they pop up, as if they were "alerts". This is consistent, not intermittent, for me. I have to swipe the banner up to remove it or hit the home button. Anybody come up with a solution? The problem seems to be widespread and Apple's response on Apple support forums is essentially not to acknowledge that the bug exists or to suggest that the user does not know how to properly configure their notifications.