iBeacon: didRangeBeacons stops getting called, must reset device for it to work again

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We have received many reports at Radius Networks of phones stopping detecting iBeacons and requiring a reboot or turning Bluetooth off and back on again to resolve the situation. Folks have reported this on iPhone 4S, iPhone 5s, iPhone 5c and iPads.

I do not have any hard evidence that this is something that broke as of iOS 7.1, but the report frequency has gone way up since its release. The circumstantial evidence is therefore pretty strong.

When this phone gets into this state, the phone can still scan for bluetooth devices, and can still transmit as an iBeacon. It is therefore not a hardware problem with Bluetooth. Based on the available evidence, it is most likely a newly introduced bug in CoreLocation.

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