Apple has been scrambling to address issues with iOS 6. The next security and maintenance release for iDevices is reportedly scheduled for release next week.
"German site iPhone-Ticker reports [Google translation] that Apple is planning to release iOS 6.1.2 early next week to address both the Exchange bug and lock screen passcode issue affecting iOS 6.1 users. According to the report, iOS 6.1.2 is likely to arrive before Wednesday, February 20."
Apple has been trying to squash bugs related to battery performance on with the iPhone 4S, recurring meeting invitations being sent from users of Microsoft Exchange Server, and a particularly worrisome lock screen bypass bug.