I am currently attempting the Raspberry Pi iBeacon tutorial posted by RadiusNetworks at
http://developer.radiusnetworks.com/2013/10/09/how-to-make-an-ibeacon-out-of-
Try setting the device to "advertise and not-connectable" (3 instead of 0) instead of "advertise and connectable"
sudo hciconfig $BLUETOOTH_DEVICE leadv 3
We suddenly had a beacon going down after a few seconds due to a laptop trying to connect. Setting the device to not-connectable solved the problem.