iOS 9.1 disables iPhone alarms set in the application Clock, in the case where users choose to install the update overnight, when they do not use the devices constantly.
Company Apple Lossless Audio CODEC (ALAC), implemented in iOS 9 the option to install iOS updates overnight, when we don't use the terminals, and this system seems to have a problem that disables the alarms set in the application Clock, of the operating system.
Although I would have expected these days that various people would have problems with the time displayed by iOS due to the switch to winter time, here is that in reality the overnight update to iOS 9.1 she is the one who generates the biggest problems, so you blame her.
The problem does not appear when you do the Software Update, OTA Update, directly when you use the terminals, so the bug will only be activated when you choose to install overnight, when you are not constantly using the terminals for various tasks.
Of course, Apple has not commented on the problem in any way, although it seems that many users are affected, and of course an update for the iOS operating system is needed to solve the problem in the future, so it is advisable not to use the system iOS 9 which updates iOS 9.1 overnight.
In the previous versions of iOS 9, the Apple company solved some problems with the alarms of the Clock application, so it is possible that this bug is related to some modification made by those from Cupertino in the past.
