locationManager:rangingBeaconsDidFailForRegion:withError: kCLErrorDomain 16

Question

I have read CLLocationManager kCLErrorDomain Codes? as well as Apple Docs

I check to make sure ranging is available before calling startRangingBeaconsInRegion: and I am

Answer 1

The problem is closely related to the CoreBluetooth Unknown Error 1309.

In some circumstance, seems that the CoreBluetooth Stack become corrupted and the only solution is to reboot the device.

There're plenty of users that are reporting such behaviour. We've fired a bug to Apple Radar and we're waiting for response.

You can also report the problem to Apple Radar so that they will notice this bug.