When we are using Core Location API with CLLocationManager, it seem function stopRangingBeaconsInRegion, to stop monitoring for a region. (if we start monitoring before)
After some research i find a potentially explication in apple documentation
stopRangingBeaconsInRegion: Stops the delivery of notifications for the specified beacon region.
So i’m not sure but, it could also stop notification for monitoring.
You can find a exemple https://github.com/Estimote/iOS-SDK/issues/192 to test it