Do Not Disturb won't work on my iPhone 5 .. tried the schedule feature, tried turning it on and not having a schedule etc .. still allows alerts to come through .. funny how it wakes me up even without a sound .. any ideas as to how to fix it ?? the tech gurus at Best Buy said it's a known issue with iOS 6 and a patch will be forthcoming .. sounds LAME to me .. any help would be appreciated, as OBVIOUSLY others have had the feature function properly .. THX ..