In a support article on its website, Apple has acknowledged that a bug is keeping iOS devices’ Do Not Disturb feature active past its scheduled time. It says that the bug will automatically correct itself after January 7, 2013.
Do Not Disturb is a feature added by Apple in iOS 6, and allows you to block all but the most important notifications from lighting up your device or making noise. Do Not Disturb includes a scheduling feature which allows it to automatically shut the mode off at a set time.
Do Not Disturb scheduling feature will resume normal functionality after January 7, 2013. Before this date, you should manually turn the Do Not Disturb feature on or off.To turn off the scheduling feature, tap Settings > Notifications > Do Not Disturb and switch Scheduled to Off.
The bug was causing the feature not to shut off as scheduled, leaving the feature enabled until it was toggled off manually. Some even reported a reboot being necessary before their devices would acknowledge the switch.
Apple began airing a clever, but poorly timed, advertisement promoting Do Not Disturb over the New Year’s holiday: