Apple usually tests updates before release. IOS version 13.1.3 was an exception. The update appeared immediately in the form of a final assembly. This is probably the fault of iOS 13.1.2.
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What's the trouble? iOS 13.1.2 was full of bugs. Users complained about the abrupt call interruption. By themselves, the microphone and speaker stopped working.
Also, iOS 13.1.2 sometimes did not display calls. Plus, some are faced with overheating of the iPhone. The above is only a small part of the problems.
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Fortunately, the situation has improved in iOS 13.1.3. The firmware number is 17A878 and weighs about 150 MB (depending on the device). Apple fixed several serious bugs.
Daylight saving time no longer distorts Health data
Applications using Game Center launch faster
Vibration and beep are not muted when an incoming call
Bluetooth headsets and hearing aids connect more reliably
Meeting invitations in Mail open normally
Notifications come again on the Apple Watch
ICloud recovered software downloads smoothly
The list is incomplete. The remaining changes are appreciated personally. Just download and install iOS 13.1.3. However, users report that the platform is not very stable.
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There is information about the constant unloading of applications from RAM. Someone does not save screenshots. Cameras on the iPhone 11 Pro and iPhone 11 Pro Max do not switch as needed.
Is the same observed? We'll have to wait for iOS 13.1.4.